Columbia subject headings:
Harvard subject headings:
Geopolitics--Russia (Federation)
Geopolitics--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Russia (Federation)
Princeton subject headings:
Geopolitics--Russia (Federation)
Geopolitics--Ukraine.
Russia (Federation)--Politics and government--1991-
Ukraine Conflict, 2014-
Ukraine--Politics and government--1991-