The answer is: The United States and the Soviet Union.
Democratic America and the communist Soviet Union engaged in an extent of time of political strain between 1946 and 1991, which started when the U.S. launched a policy to prevent Soviet and communist expansion.
Although the conflict did not involve major fighting, The U.S. provided support and military forces to assist countries threatened by communism. Finally, after a period of arduous competition regarding nuclear weapons, the Intermediate Nuclear Forces Treaty in 1987 removed all kinds of nuclear armament.
