Columbia subject headings:
Harvard subject headings:
Geopolitics--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Security, International--Europe.
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Russia (Federation)
Princeton subject headings:
Russia (Federation)--Foreign relations--Ukraine.
Russia (Federation)--History--1991-
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Russia (Federation).
Ukraine--History--1991-