Columbia subject headings:
Europe, Eastern--Foreign relations--Soviet Union.
Europe, Eastern--Politics and government.
Soviet Union--Foreign relations--Europe, Eastern.
Harvard subject headings:
Europe, Eastern--Foreign relations--Soviet Union.
Europe, Eastern--Politics and government.
Soviet Union--Foreign relations--Europe, Eastern.
Princeton subject headings:
Europe, Eastern--Foreign relations--Soviet Union.
Europe, Eastern--Politics and government.
Soviet Union--Foreign relations--Europe, Eastern.