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Nuclear warfare, or atomic warfare, is a military conflict or political strategy in which nuclear weaponry is detonated on an opponent. Compared to conventional warfare, nuclear warfare can be vastly more destructive in range and extent of damage. A major nuclear exchange could have severe long-term effects, primarily from radiation release but also from possible atmospheric pollution leading to nuclear winter, that could last for decades, centuries, or even millennia after the initial attack.[1][2] Nuclear war is considered to bear existential risk for civilization on Earth.[3][4]
Only two nuclear weapons have been used in the course of warfare, both by the United States near the end of World War II. On 6 August 1945, a uranium gun-type device code-named "Little Boy" was detonated over the Japanese city of Hiroshima. Three days later, on 9 August, a plutonium implosion-type device code-named "Fat Man" was exploded over Nagasaki, Japan. These two bombings resulted in the deaths of approximately 200,000 Japanese people—mostly civilians—from acute injuries sustained from the explosions.[5]
After World War II, nuclear weapons were also developed by the United Kingdom, France, the Soviet Union, and the People's Republic of China, which contributed to the state of conflict and tension that became known as the Cold War. In the 1970s, India and in the 1990s, Pakistan, countries openly hostile to each other, developed nuclear weapons. Israel, North Korea, and South Africa are also believed to have developed nuclear weapons, although South Africa became the first country to subsequently abandon them. Nuclear weapons have been detonated on over two thousand occasions for testing purposes and demonstrations.
After the collapse of the Soviet Union in 1991 and the resultant end of the Cold War, the threat of a major nuclear war between the superpowers was generally thought to have receded. Since then, concern over nuclear weapons has shifted to the prevention of localized nuclear conflicts resulting from nuclear proliferation, and the threat of nuclear terrorism.
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The possibility of using nuclear weapons in war is usually divided into two subgroups, each with different effects and potentially fought with different types of nuclear armaments.
The first, a limited nuclear war (sometimes attack or exchange), refers to a small scale use of nuclear weapons by one or more parties. A "limited nuclear war" would consist of a limited exchange between two nuclear powers targeting each other's military facilities, either as an attempt to pre-emptively cripple the enemy's ability to attack as a defensive measure or as a prelude to an invasion by conventional forces as an offensive measure. This term would apply to any limited use of nuclear weapons, which may involve either military or civilian targets.
The second, a full-scale nuclear war, consists of large numbers of weapons used in an attack aimed at an entire country, including military, economic and civilian targets. Such an attack would almost certainly destroy the entire economic, social, and military infrastructure of the target nation, and would probably have a devastating effect on Earth's biosphere.
Some Cold War strategists such as Henry Kissinger[6] argued that a limited nuclear war could be possible between two heavily armed superpowers (such as the United States and the Soviet Union) and if so several predicted that a limited war could "escalate" into an all-out war. Others have called limited nuclear war "global nuclear holocaust in slow motion" arguing that once such a war took place others would be sure to follow over a period of decades, effectively rendering the planet uninhabitable in the same way that a "full-scale nuclear war" between superpowers would, only taking a much longer and more agonizing path to reach the same result.
Even the most optimistic predictions of the effects of a major nuclear exchange foresee the death of a hundred million people within a very short amount of time; more pessimistic predictions argue that a full-scale nuclear war could bring about the extinction of the human race or its near extinction with a handful of survivors (mainly in remote areas) reduced quality of life and life expectancy for centuries after and cause permanent damage to most complex life on the planet, Earth's ecosystems, and the global climate, particularly if predictions of nuclear winter are accurate.
A study presented at the annual meeting of the American Geophysical Union in December 2006 asserted that even a small-scale, regional nuclear war could produce as many direct fatalities as all of World War II and disrupt the global climate for a decade or more. In a regional nuclear conflict scenario in which two opposing nations in the subtropics each used 50 Hiroshima-sized nuclear weapons (ca. 15 kiloton each) on major populated centers, the researchers estimated fatalities from 2.6 million to 16.7 million per country. Also, as much as five million tons of soot would be released, which would produce a cooling of several degrees over large areas of North America and Eurasia, including most of the grain-growing regions. The cooling would last for years and could be "catastrophic" according to the researchers.[7]
Either a limited or full-scale nuclear exchange could be an accidental nuclear war, in which a nuclear war is triggered unintentionally. Possible triggers for this scenario have included malfunctioning early warning devices and targeting computers, deliberate malfeasance by rogue military commanders, accidental straying of planes into enemy airspace, reactions to unannounced missile tests during tense diplomatic periods, reactions to military exercises, mistranslated or misscommunicated messages, and so forth. A number of these scenarios did actually occur during the Cold War, though none resulted in a nuclear exchange.[8] Many such scenarios have been depicted in popular culture, such as in the 1962 novel Fail-Safe (released as a film in 1964) and the film Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb, also released in 1964.
During the final stages of World War II in 1945, the United States conducted two atomic bombings against the cities of Hiroshima and Nagasaki in Japan, the first on August 6, 1945 and the second on August 9, 1945. These two events are the only use of nuclear weapons in war to date.[9]
For six months before the atomic bombings, the United States intensely fire-bombed 67 Japanese cities. Together with the United Kingdom and the Republic of China, the United States called for a surrender of Japan in the Potsdam Declaration on July 26, 1945. The Japanese government ignored this ultimatum. By executive order of President Harry S. Truman, the U.S. dropped the nuclear weapon "Little Boy" on the city of Hiroshima on Monday, August 6, 1945,[10][11] followed by the detonation of "Fat Man" over Nagasaki on August 9.
Within the first two to four months of the bombings, the acute effects killed 90,000–166,000 people in Hiroshima and 60,000–80,000 in Nagasaki,[12] with roughly half of the deaths in each city occurring on the first day. The Hiroshima prefectural health department estimates that, of the people who died on the day of the explosion, 60% died from flash or flame burns, 30% from falling debris and 10% from other causes. During the following months, large numbers died from the effect of burns, radiation sickness, and other injuries, compounded by illness. In a U.S. estimate of the total immediate and short term cause of death, 15–20% died from radiation sickness, 20–30% from flash burns, and 50–60% from other injuries, compounded by illness.[13] In both cities, most of the dead were civilians.[14][15][16]
Six days after the detonation over Nagasaki, on August 15, Japan announced its surrender to the Allied Powers, signing the Instrument of Surrender on September 2, officially ending the Pacific War and therefore World War II, as Germany had already signed its Instrument of Surrender on May 7, ending the war in Europe. The bombings led, in part, to post-war Japan's adopting Three Non-Nuclear Principles, forbidding the nation from nuclear armament.[17] The role of the bombings in Japan's surrender and the U.S.'s ethical justification for them, as well as their strategic importance, is still debated.[18]
Immediately after the bombings of Japan, the status of atomic weapons in international and military relations was unclear. Presumably, the United States hoped atomic weapons could offset the Soviet Union's superior conventional ground forces in Eastern Europe, and possibly be used to pressure Soviet leader Joseph Stalin into concessions. Under Stalin, the Soviet Union pursued its own atomic capabilities through scientific research and espionage against the American program. The Soviets believed that the Americans, with their limited nuclear arsenal, were unlikely to engage in any new world wars, while the Americans were not confident they could prevent a Soviet takeover of Europe, despite their atomic advantage.
Within the United States the authority to produce and develop nuclear weapons was removed from military control and put instead under the civilian control of the United States Atomic Energy Commission. This decision reflected an understanding that nuclear weapons had unique risks and benefits separate from other military technology.
For several years after World War II, the US developed and maintained a strategic force based on the Convair B-36 bomber that would be able to attack any potential enemy from bomber bases in the US. It deployed atomic bombs around the world for potential use in conflicts. Over a period of a few years, many in the US defense community became increasingly convinced of the invincibility of the United States to a nuclear attack. Indeed, it became generally believed that the threat of nuclear war would deter any strike against the United States.
Many proposals were suggested to put all US nuclear weapons under international control—for example, by the newly formed United Nations — as an effort to deter both their usage and an arms race. However no terms could be arrived at that would be agreed upon by both the US and the USSR.
On August 29, 1949 the USSR tested its first nuclear weapon at Semipalatinsk in Kazakhstan (see also Soviet atomic bomb project). Scientists in the United States from the Manhattan Project had warned that, in time, the Soviet Union would certainly develop nuclear capabilities of its own. Nevertheless, the effect upon military thinking and planning in the US was dramatic, primarily because American military strategists had not anticipated the Soviets would "catch up" so soon. However, at this time, they had not discovered that the Russians had conducted significant espionage of the project from spies at Los Alamos, the most significant of which was done by the theoretical physicist Klaus Fuchs. The first Soviet bomb was more or less a deliberate copy of the Fat Man device.
With the monopoly over nuclear technology broken, worldwide nuclear proliferation accelerated. The United Kingdom tested its first independent atomic bomb in 1952, followed by France in 1960 and then the People's Republic of China in 1964. While much smaller than the arsenals of the USA and the USSR, Western Europe's nuclear reserves were nevertheless a significant factor in strategic planning during the Cold War. A top-secret white paper produced for the British Government in 1959, compiled by the Royal Air Force, estimated that British atomic bombers were capable of destroying key cities and military targets in the Soviet Union, with an estimated 16 million deaths in the USSR (half of whom were estimated to be killed on impact and the rest fatally injured) before bomber aircraft from the United States' Strategic Air Command reached their targets.
We knew the world would not be the same. A few people laughed, a few people cried. Most people were silent. I remembered the line from the Hindu scripture, the Bhagavad-Gita; Vishnu is trying to persuade the Prince that he should do his duty and, to impress him, takes on his multi-armed form and says, 'Now I am become Death, the destroyer of worlds.' I suppose we all thought that, one way or another.'[19]
Though the USSR had nuclear weapon capabilities in the beginning of the Cold War, the US still had an advantage in terms of bombers and weapons. In any exchange of hostilities, the US would have been capable of bombing the USSR, while the USSR would have more difficulties arranging the reverse.
The widespread introduction of jet-powered interceptor aircraft upset this imbalance somewhat by reducing the effectiveness of the US bomber fleet. In 1949 Curtis LeMay was placed in command of the Strategic Air Command and instituted a program to update the bomber fleet to one that was all-jet. During the early 1950s the B-47 and B-52 were introduced, providing the ability to bomb the USSR more easily. Before the development of a capable strategic missile force in the Soviet Union, much of the war-fighting doctrine held by western nations revolved around using a large number of smaller nuclear weapons used in a tactical role. It is debatable whether such use could be considered "limited" however, because it was believed that the US would use their own strategic weapons (mainly bombers at the time) should the USSR deploy any kind of nuclear weapon against civilian targets. Douglas MacArthur, an American general, was fired by President Harry Truman, partially because he persistently requested permission to use his own discretion in deciding whether to use atomic weapons on the People's Republic of China in 1951 (as the Korean War was raging).[20] Mao Zedong, China's communist leader, gave the impression that he would welcome a nuclear war with the capitalists because it would annihilate their imperialist system.[21][22]
Several scares about the increasing ability of the USSR's strategic bomber forces surfaced during the 1950s. The defensive response by the US was to deploy a fairly strong layered defense consisting of interceptor aircraft and anti-aircraft missiles, like the Nike, and guns, like the Skysweeper, near larger cities. However this was a small response compared to the construction of a huge fleet of nuclear bombers. The principal nuclear strategy was to massively penetrate the USSR. Because such a large area could not be defended against this overwhelming attack in any credible way, the USSR would lose any exchange.
This logic became ingrained in US nuclear doctrine and persisted for the duration of the Cold War. As long as the strategic US nuclear forces could overwhelm their USSR counterparts, a Soviet preemptive strike could be averted. Moreover, the USSR could not afford to build any reasonable counterforce as the economic output of the United States was far larger than that of the Soviets, and they would be unable to achieve nuclear parity.
Soviet nuclear doctrine, however, did not match US nuclear doctrine.[23] Soviet planning expected a large-scale nuclear exchange followed by a conventional war which itself would involve heavy use of tactical nuclear weapons. Unfortunately, US doctrine rather assumed that Soviet doctrine was similar—the mutual in Mutually Assured Destruction necessarily requiring that the other side see things in much the same way, rather than believing, as the Soviets did, that they could fight a large-scale, combined nuclear and conventional war.
A revolution in nuclear strategic thought occurred with the introduction of the intercontinental ballistic missile (ICBM), which the USSR first successfully tested in August 1957. In order to deliver a warhead to a target, a missile was more cost-effective than a bomber, and enjoyed a higher survivability due to the enormous difficulty of interception of the ICBMs due to their high altitude and speed. The USSR could now afford to achieve nuclear parity with the US in terms of raw numbers, although for a time they appeared to have chosen not to.
Photos of Soviet missile sites set off a wave of panic in the US military, something the launch of Sputnik would do for the public a few months later. Politicians, notably then-US Senator John Kennedy suggested a "missile gap" between the Soviets and the US. The US military gave missile development programs the highest national priority, and several spy aircraft and reconnaissance satellites were designed and deployed to observe Soviet progress.
Issues came to a head during the Cuban Missile Crisis in 1962. The Soviet Union placed medium range missiles 90 miles (140 km) from the US - a move considered by many as a direct response to American Jupiter missiles placed in Turkey. After intense negotiation, the Soviets ended up removing the missiles from Cuba and decided to institute a massive building program of their own. In exchange, the US dismantled its launch sites in Turkey, although this was done secretly and was not publicly revealed for over two decades. Khrushchev did not even reveal this part of the agreement when he came under fire by political opponents for mishandling the crisis.
By the late 1960s, the number of ICBMs and warheads was so high on both sides that it was believed either the USA or USSR was capable of completely destroying the other country's infrastructure and population. Thus a balance of power system known as mutually assured destruction (MAD) came into being. It was thought that any full-scale exchange between the powers could not produce a victorious side and thus neither would risk initiating one.
One drawback of this doctrine was the possibility of a nuclear war occurring without either side intentionally striking first. Early warning systems were notoriously error-prone. On 78 occasions in 1979, for example, a "missile display conference" was called to evaluate detections potentially threatening to the North American continent. Some of these were trivial errors, spotted quickly. But several went to more serious levels. On September 26, 1983, Stanislav Petrov received convincing indications of a US first strike launch against the USSR but positively identified the warning as a false alarm. Though it is unclear what role Petrov's actions played in preventing a nuclear war, he has been honored by the United Nations for his actions.
Similar incidents happened many times in the US, due to failed computer chips,[24] flights of geese, test programs, and bureaucratic failures to notify early warning military personnel of legitimate launches of test or weather missiles. For many years, US strategic bombers were kept airborne on a rotating basis round the clock, until the number and severity of accidents persuaded policymakers it was not worthwhile.
By the late 1970s, citizens in the US and USSR (and indeed the entire world) had been living with MAD for about a decade. It became deeply ingrained into the popular culture. Such an exchange would have killed many millions of individuals directly and possibly induced a nuclear winter which could have led to the death of a large portion of humanity and, potentially, the collapse of global civilization.
On May 18, 1974, India conducted its first nuclear test in the Pokhran test range. The name of the operation was Smiling Buddha and India termed the test as a "peaceful nuclear explosion".
According to the 1980 United Nations report General and Complete Disarmament: Comprehensive Study on Nuclear Weapons: Report of the Secretary-General, it was estimated that in total there were approximately 40,000 nuclear warheads in existence at that time with a total yield of approximately 13,000 megatons. By comparison, when the volcano Mount Tambora erupted in 1815 (turning 1816 into the Year Without A Summer due to the levels of ash expelled), it exploded with a force of roughly 1,000 megatons. Many people believed that a full-scale nuclear war could result in the extinction of the human species, though not all analysts agreed on the assumptions required for these models.
The idea that any nuclear conflict would eventually escalate was a challenge for military strategists. This challenge was particularly severe for the United States and its NATO allies because it was believed until the 1970s that a Soviet tank invasion of Western Europe would quickly overwhelm NATO conventional forces, leading to the necessity of escalating to tactical nuclear weapons.
A number of interesting concepts were developed. Early ICBMs and bombers were inaccurate, which led to the concept of countervalue strikes — attacks directly on the enemy population leading to a collapse of the enemy's will to fight. During the Cold War the USSR invested in extensive protected civilian infrastructure such as large nuclear-proof bunkers and non-perishable food stores. In the US, by comparison, smaller scale civil defense programs were instituted starting in the 1950s where schools and other public buildings had basements stocked with non-perishable food supplies, canned water, first aid, dosimeter and Geiger counter radiation measuring devices. Many of the locations were given "Fallout Shelter" designation signs. Also, CONELRAD Radio information systems were adopted, whereby the commercial radio sector would broadcast on two AM frequencies in the event of a CD emergency. These two frequencies can be seen on 1950s vintage radios on online auction sites and museums, with many of these radios still in use on tabletops across America. Also, the occasional backyard fallout shelter was built by private individuals.
This strategy had one major and possibly critical flaw, soon realised by military analysts but highly underplayed by the US military: Conventional NATO forces in the European theatre of war were outnumbered by similar Soviet and Warsaw Pact forces, and it was assumed that in case of a major Soviet attack (commonly perceived as the "red tanks rolling towards the North Sea" scenario) that NATO, in the face of conventional defeat, would soon have no other choice but to resort to tactical nuclear strikes. Most analysts agreed that once the first nuclear exchange had occurred, escalation to global nuclear war would become almost inevitable.
In the late seventies and early eighties the US renewed its commitment to a powerful military, which required large spending on military programs. These programs, originally part of President Jimmy Carter's defense budget, included spending on conventional and nuclear weapons systems, as well as defensive systems like Strategic Defense Initiative.
Another major shift in nuclear doctrine was the development of the submarine-launched ballistic (nuclear) missile, the SLBM. It was hailed by some military theorists as a weapon that would make nuclear war less likely. SLBMs, which can move with stealth virtually anywhere in the world, give a nation a "second strike" capability. Before the advent of SLBMs, thinkers feared that a nation might be tempted to initiate a first strike if it felt confident that such a strike would incapacitate the nuclear arsenal of its enemy, making retaliation impossible. With the advent of SLBMs, no nation could be certain that a first strike would incapacitate its enemy's entire nuclear arsenal. To the contrary, it would have to fear a retaliatory second strike from SLBMs. Thus a first strike was much less of a feasible option, and nuclear war was held to be less likely.
However, it was soon realized that submarines could "sneak up" close to enemy coastlines and decrease the warning time—the time between detection of the launch and impact of the missile—from as much as half an hour to under three minutes. This effect was especially significant to the United States, Britain, India and China, with their capitals all within 100 miles (160 km) of their coasts. Moscow was more secure from this type of threat. This greatly increased the credibility of a "surprise first strike" by one of the factions and theoretically made it possible to knock out or disrupt the chain of command before a counterstrike could be ordered. It strengthened the notion that a nuclear war could be "won", resulting not only in greatly increased tension, and increasing calls for fail-deadly control systems, but also in a dramatic increase in military spending. The submarines and their missile systems were very expensive (one fully equipped nuclear powered nuclear missile submarine could easily cost more than the entire GNP of a developing country),[25] but the greatest cost came in the development of both sea- and land-based anti-submarine defenses and in improving and strengthening the chain of command. As a result, military spending skyrocketed.
South Africa developed a nuclear weapon capability during the 1970s and early 1980s. It was operational for a brief period before being dismantled in the early 1990s.
On Sept. 1, 1983, Korean Air Lines Flight 007 was shot down by Soviet Jet Fighters. On the 26th, a Soviet early warning station under the command of Stanislav Petrov falsely detected 5 inbound intercontinental ballistic missiles from the US. Petrov correctly assessed the situation as a false alarm, and hence did not report his finding to his superiors. It is quite possible that this prevented World War III, as the Soviet policy at that time was immediate nuclear response upon discovering inbound ballistic missiles.
The world came unusually close to nuclear war (although perhaps not as close as during the Cuban Missile Crisis) when the Soviet Union thought the NATO military exercise Able Archer 83 was a cover up to begin a nuclear strike. The Soviets responded by readying their nuclear arsenal. Soviet fears of an attack went away once the exercise concluded without incident.
Although the dissolution of the Soviet Union ended the Cold War and greatly reduced tensions between the United States and the Russian Federation (the Soviet Union's formal successor state), both nations remained in a "nuclear stand-off" due to the continuing presence of a significant number of warheads in both nations. Additionally, the end of the Cold War led the United States to become increasingly concerned with the development of nuclear technology by other nations outside of the former Soviet Union. In 1995, a branch of the US Strategic Command produced an outline of forward-thinking strategies in the document "Essentials of Post–Cold War Deterrence".
The former chair of the United Nations disarmament committee states there are more than 16,000 strategic and tactical nuclear weapons ready for deployment and another 14,000 in storage. The U.S. has nearly 7,000 ready for action and 3,000 in storage and Russia has about 8,500 on hand and 11,000 in storage, he said. China has 400 nuclear weapons, Britain 200, France 350, India 120, and Pakistan 90. North Korea is confirmed as having nuclear weapons, though it is not known how many (a common estimate is between 1 and 10). Israel is also widely believed to have nuclear weapons. NATO has stationed 480 US nuclear weapons in Belgium, the Netherlands, Italy, Germany, and Turkey, with several other countries in pursuit of an arsenal of their own.[26]
A key development in nuclear warfare in the 2000s (decade) has been the proliferation of nuclear weapons to the developing world, with India and Pakistan both publicly testing nuclear devices and North Korea conducting an underground nuclear test on October 9, 2006. The US Geological Survey measured a 4.2 magnitude earthquake in the area where the test occurred. A further test was announced by the North Korean government on May 25, 2009.[27] Iran, meanwhile, has embarked on a nuclear program which, while officially for civilian purposes, has come under scrutiny by the United Nations and individual states.
Recent studies undertaken by the CIA cite the enduring India-Pakistan conflict as the most likely to escalate into nuclear war. During the Kargil War in 1999, Pakistan came close to using its nuclear weapons in case of further deterioration.[28] Pakistan's foreign minister had even warned that it would "use any weapon in our arsenal", hinting at a nuclear strike against India;[29] the statement was condemned by the international community with Pakistan denying it later on. It remains the only war between two declared nuclear powers. The 2001-2002 India-Pakistan standoff again stoked fears of nuclear war between the two countries.
Despite these very serious threats, relations between India and Pakistan have been improving somewhat over the last few years. A bus line directly linking Indian and Pakistani-administered Kashmir has recently been established. However, with the November 26, 2008 Mumbai terror attacks, India does not rule out war with Pakistan.
Another flashpoint which has analysts worried is a possible conflict between the United States and the People's Republic of China over Taiwan. Although economic forces have decreased the possibility of military conflict, there remains the worry that increasing military buildup (China is rapidly increasing their naval capacity) and a move toward Taiwan independence could spin out of control.
Israel is another possibility as it is thought to possess between one hundred and four hundred nuclear warheads. It has been asserted that the submarines which Israel received from Germany have been adapted to carry missiles with nuclear warheads, so as to give Israel a second strike capacity.[30] Israel has been involved in wars with its neighbours on numerous occasions, and its small geographic size would mean that in the event of future wars the Israeli military might have very little time to react to a future invasion or other major threat; the situation could escalate to nuclear warfare very quickly in some scenarios.
In the Persian Gulf, Iran appears to many observers to be in the process of developing a nuclear weapon, which has heightened fears of a nuclear conflict in the Middle East, either with Israel or with Iran's Sunni neighbors.
The above examples envisage nuclear warfare at a strategic level, i.e. total war. However, many nuclear powers are believed to have the ability to launch more limited engagements.
Sub-strategic use would see the deployment of either low-yield tactical nuclear weapons, or of scalable-yield strategic nuclear weapons in a very limited role rather than the battlefield exchanges of strategic nuclear weapons. This was described by the UK Parliamentary Defence Select Committee as "the launch of one or a limited number of missiles against an adversary as a means of conveying a political message, warning or demonstration of resolve". It is believed that all current nuclear weapons states possess tactical nuclear weapons, with the exception of the United Kingdom which decommissioned its tactical warheads in 1998, however the UK does possesses scalable-yield strategic warheads. American, French and British nuclear submarines are believed to carry some missiles with such warheads for this purpose, potentially allowing a strike as low as one kiloton against a single target. Only the People's Republic of China and the Republic of India have declarative, unqualified, unconditional no first use policies.
Commodore Tim Hare, former Director of Nuclear Policy at the British Ministry of Defence, has described Sub-strategic use as offering the Government "an extra option in the escalatory process before it goes for an all-out strategic strike which would deliver unacceptable damage".[31] However, this sub-strategic capacity has been criticized as potentially increasing the acceptability of using nuclear weapons. The related consideration of new generations of limited-yield nuclear weapons by the United States has also alarmed anti-nuclear groups, who believe it will make the use of nuclear weapons more acceptable.
Also of note is that the United States adopted a policy in 1996 of allowing the targeting of its nuclear weapons at "non-state actors" armed with weapons of mass destruction.[32]
Nuclear terrorism by non-state organizations is an unknown factor in nuclear deterrence thinking, as states possessing nuclear weapons are susceptible to retaliation in kind, but sub- or trans-state actors are not. The collapse of the Soviet Union led to the possibility that former Soviet nuclear weapons might become available on the black market (so-called 'loose nukes'), while no warheads are known to have been mislaid, it has been alleged that suitcase-size bombs might be unaccounted for.
Another possible nuclear terrorism threat are devices designed to disperse radioactive materials over a large area using conventional explosives, called dirty bombs. The detonation of a dirty bomb would not cause a nuclear explosion, nor would it release enough radiation to kill or injure a lot of people. However, it could cause severe disruption and require potentially costly decontamination.[33]
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