Monetary overhang
Monetary overhang is a phenomenon in which people have money holdings because of a lack of ability to spend them. This is a phenomenon often present with repressed inflation and was common in the Soviet Union. The solution to this is usually a swift burst of inflation.
In the Soviet Union, which was dissolved in 1990/1991, monetary overhang led to hyperinflation. The International Monetary Fund subsidised the currency to stabilise it, but Russia chose to end that arrangement in 1998.