Columbia subject headings:
Crimea (Ukraine)--Annexation to Russia.
Crimea (Ukraine)--History.
Crimea (Ukraine)--Politics and government.
Crimea (Ukraine)--Relations--Russia (Federation)
Russia (Federation)--Relations--Ukraine--Crimea.
Harvard subject headings:
Crimea (Ukraine)--Annexation to Russia (Federation)
Crimea (Ukraine)--History.
Crimea (Ukraine)--Politics and government.
Princeton subject headings: