Columbia subject headings:
Economic sanctions, American--Russia (Federation)
Russia (Federation)--Foreign relations--United States.
Ukraine--Foreign relations--United States.
Ukraine--Politics and government--1991-
United States--Foreign relations--Russia (Federation)
United States--Foreign relations--Ukraine.
Harvard subject headings:
Economic sanctions, American--Russia (Federation)
Military assistance, American--Ukraine.
Putin, Vladimir Vladimirovich, 1952-
Russia (Federation)--Foreign relations--Ukraine.
Ukraine--Foreign relations--Russia (Federation)
Ukraine--Politics and government--21st century.
Princeton subject headings:
Economic sanctions, American--Russia (Federations).
Russia (Federation)--Foreign relations--United States.
Ukraine--Foreign relations--United States.
Ukraine--Politics and government--1991-
United States--Foreign relations--Russia (Federation)
United States--Foreign relations--Ukraine.