After 1956 the new Soviet leaders tried to increase the 'unity' of the bloc member countries, including transnational organizations, but their proposals made early in 1966 failed. One of all reactions in the Soviet Bloc was the particular reform evolution in Czechoslovakia in 1968 (the Prague Spring). Moscow rapidly changed positions to policy of the CPCz reform wing leader A. Dubcek and strongly criticized of the development in Czechoslovakia. Soviet leaders increased of pressure tactics to the final decision to crush the Czechoslovak experiment with military power. The preparation and motives of the Soviet intervention and its short-term as well as long-term consequences are analyzed. The intervention made it possible for Moscow to start reintegrating its bloc in the following year, which now faced only little resistance on the part of its allies (Rumania). An important tool in Moscow's hands became the newly formulated and publicly proclaimed Brezhnev Doctrine, which was used by the USSR to justify its intervention in Czechoslovakia, but was primarily intended for the 1970s.
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