Columbia subject headings:
Russia (Federation)--Relations--Ukraine--21st century.
Ukraine Conflict, 2014-
Ukraine--Politics and government--21st century.
Ukraine--Relations--Russia (Federation)--21st century.
Harvard subject headings:
Princeton subject headings:
Russia (Federation)--Relations--Ukraine--21st century.
Ukraine Conflict, 2014-
Ukraine--Politics and government--21st century.
Ukraine--Relations--Russia (Federation)--21st century.