Columbia subject headings:
Harvard subject headings:
Russia (Federation)--Military relations--Ukraine.
Russia (Federation). Voenno-Morskoĭ Flot. Chernomorskiĭ flot--History.
Princeton subject headings:
Crimea.
History (General)
History (general) and history of Europe.
Military and naval history.
Russia (Federation)--Military relations--Ukraine.
Russia (Federation). Voenno-Morskoĭ Flot. Chernomorskiĭ flot--History.
Ukraine--Military relations--Russia (Federation).
Ukraine.