Columbia subject headings:
Crimea (Ukraine)--Ethnic relations.
Crimea (Ukraine)--Politics and government.
Security, International.
Harvard subject headings:
Crimea (Ukraine)--Annexation to Russia.
Crimea (Ukraine)--Ethnic relations.
Crimea (Ukraine)--Politics and government.
Security, International
Princeton subject headings:
Crimea (Ukraine)--History.
Crimea (Ukraine)--Politics and government.