Columbia subject headings:
Communist countries--Politics and government.
Europe, Eastern--Foreign relations--Soviet Union.
Sovereignty.
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Foreign relations.
Harvard subject headings:
Communist countries--Politics and government.
Europe, Eastern--Foreign relations--Soviet Union.
Sovereignty.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Foreign relations.
Princeton subject headings:
Communist countries--Politics and government.
Europe, Eastern--Foreign relations--Soviet Union.
Sovereignty.
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Foreign relations.