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- (international law) A pact (long-term alliance treaty) signed on May 14, 1955 in Warsaw by the Soviet Union and its Communist military allies in Europe.
- The Warsaw Pact formalized Moscow's dominance in Europe's east
- (metonymically) The Warsaw Treaty Organization that was established by the above treaty; a strategic alliance comparable and opposed to NATO.
- (treaty) Treaty of Friendship, Cooperation and Mutual Assistance (full official name)