# Warsaw Pact The [[Soviet Union]]'s military alliance (1955–1991), created as the communist counterpart to NATO. Member states: the USSR, Poland, East Germany, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania (withdrew 1968). The Pact provided the legal framework for Soviet military interventions to crush reform movements — Hungary 1956, Czechoslovakia 1968 — under the Brezhnev Doctrine that socialist states had a collective obligation to prevent any member from leaving the bloc. The Warsaw Pact dissolved in July 1991, and several of its former members subsequently joined NATO — a geographic expansion that Russia under Putin has framed as a betrayal of alleged Western promises and a core justification for the invasion of [[Ukraine]]. ## See Also - [[Eastern Bloc]] — the political framework the Pact enforced militarily - [[Soviet Union]] — the hegemon - [[Ukraine]] — where the Pact's legacy shapes current conflict