Question

Why the countries decreased their nuclear stock piles after 1990 ?​

Answer 1

$\huge \boxed{ \fcolorbox{white}{blue}{Answer}}$

The Soviet Union developed its first nuclear weapon in 1949 and increased its nuclear stockpile rapidly until it peaked in 1986 under Mikhail Gorbachev. As Cold War tensions decreased, and after the collapse of the Soviet Union, the Soviet and Russian nuclear stockpile decreased by over 80% between 1986 and 2012.

U.S. and Soviet/Russian nuclear weapons stockpiles/inventories from 1945 to 2006. The failing Soviet economy and the dissolution of the country between 1989-91 which marks the end of the Cold War and with it the relaxation of the arms race, brought about a large decrease in both nations stockpiles.