United Kingdom declaration of war on Japan (1941)

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On December 8, 1941, the War Cabinet of His Majesty's Government authorized the immediate declaration of war on Japan, following the Japanese attacks on Malaya, Singapore and Hong Kong. The foreign minister, Anthony Eden was in transit to Moscow at the time, so Winston Churchill was in charge of the Foreign Office. The text of his letter to the Japanese Ambassador was as follows:

'Sir',

On the evening of December 7^th His Majesty's Government in the United Kingdom learned that Japanese forces without previous warning either in the form of a declaration of war or of an ultimatum with a conditional declaration of war had attempted a landing on the coast of Malaya and bombed Singapore and Hong Kong.

In view of these wanton acts of unprovoked aggression committed in flagrant violation of International Law and particularly of Article I of the Third Hague Convention relative to the opening of hostilities, to which both Japan and the United Kingdom are parties, His Majesty's Ambassador at Tokyo has been instructed to inform the Imperial Japanese Government in the name of His Majesty's Government in the United Kingdom that a state of war exists between our two countries.

I have the honour to be, with high consideration,

Sir,

Your obedient servant,

Winston S. Churchill

Of the letter, Churchill later wrote: "Some people did not like this ceremonial style. But after all, when you have to kill a man, it costs nothing to be polite"