Soviet foreign policy aimed at keeping under the military-political control of the USSR (if it was necessary – by force) the Eastern European countries, which fell under its influence as a result of the Second World War, demanded its detailed ideological justification in August 1968, when the joint military action of 5 countries, members of Warsaw Treaty in Czechoslovakia was undertaken. The thesis of the collective responsibility of the socialist countries in defending socialism in each of them was voiced in Brezhnev’s conversation with the Yugoslav leader Tito in April 1968, was reflected also in some declarations of Summer 1968 and later, after the suppression of the Prague Spring on August 21, 1968, in a number of program articles of Pravda and also in the speech of Brezhnev at the 5th Congress of the Polish United Workers Party in November 1968. The concept of the Soviet foreign policy towards the bloc allies, which was reflected in these documents, was defined in the West as the doctrine of limited sovereignty or the “Brezhnev doctrine”. With the coming to power of Mikhail Gorbachev and his team in 1985 the Soviet leadership launched a revision of the principles of its policy towards the allied countries. The thesis of the unacceptability of the former methods of bloc politics was first voiced at the Politburo in summer of 1986. In December 1989, after the velvet revolution in Czechoslovakia, the Soviet leadership officially announced a revision of its attitude to the suppression of the Prague Spring.