Columbia subject headings:
Conference on Security and Cooperation in Europe.
Europe, Eastern--Foreign relations--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Princeton subject headings:
Europe, Eastern--Relations--Soviet Union.
Soviet Union--Politics and government--1982-.
Soviet Union--Relations--Europe, Eastern.