Columbia subject headings:
Harvard subject headings:
Diplomats--Correspondence, reminiscences, etc.
Japan--Foreign relations--20th century.
World politics--20th century
Princeton subject headings:
China--Foreign relations--Japan.
Europe, Eastern--Politics and government.
Japan--Foreign relations--China.
Okada, Akira, 1918-2017.
Soviet Union--Foreign relations--1945-1991.