Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-
Soviet Union--Foreign relations--1985-1991.
Soviet Union--Foreign relations--Europe.
Princeton subject headings:
Europe--Foreign relations--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-2022.
Soviet Union--Foreign relations--1985-1991.
Soviet Union--Foreign relations--Europe.