Columbia subject headings:
Harvard subject headings:
Korea--Foreign relations--Russia.
Korea--Foreign relations--Soviet Union.
Russia--Foreign relations--Korea.
Soviet Union--Foreign relations--Korea.
Princeton subject headings:
Korea (North)--Foreign relations--Soviet Union.
Korea--Foreign relations--Russia.
Korea--Foreign relations--Soviet Union.
Russia--Foreign relations--Korea.
Soviet Union--Foreign relations--Korea (North).
Soviet Union--Foreign relations--Korea.