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After the Berlin blockade in 1949, western countries joined together as the [[North Atlantic Treaty Organization]] (NATO). In response, in 1955, the [[Soviet Union]] formed a communist alliance in the '''Warsaw Pact''', which included most of the communist countries of Eastern Europe (not including Yugoslavia) and the Soviet Union itself.

The '''Warsaw Pact''' (''Officially the'' '''Treaty of Friendship, Co-operation and Mutual Assistance''', ''Russian'' '''Договор о дружбе, сотрудничестве и взаимной помощи''') was a political and military organization made up of the [[communism|communist]] states of Eastern Europe. The Warsaw Pact was officially formed on May 14, 1955, in response to the integration of [[West Germany]] in to [[NATO]]. The Warsaw Pact effectively lasted until November 9, 1989, when the [[Berlin Wall]].<ref>[http://www.fordham.edu/halsall/mod/1955warsawpact.html The Warsaw Pact], ''Fordham University''</ref>