Columbia subject headings:
Geopolitics--Ukraine--History--20th century.
Ukraine--Foreign relations.
Ukraine--Politics and government.
Harvard subject headings:
Political science--Ukraine--History.
Ukraine--Foreign relations.
Ukraine--History--20th century.
Ukraine--Politics and government.
Princeton subject headings:
Political science--Ukraine--History.
Ukraine--Foreign relations.
Ukraine--History--20th century.
Ukraine--Politics and government.