They obviously hated the total lack of freedom and the economic deprivation that meant with being satellite states of the oppressive USSR. And by the way the USSR itself imploded the citizens of the USSR also hated the Communist tyranny and lack of economic well-being which was far behind western Europe.
In 1955 the Soviet Union and its satellites signed the Warsaw Pact. Like NATO the pact pledged each nation to defend the others in the alliance. the Soviet Union also used the pact to keep control over its satellites.
