Southern Naval Base (Ukrainian: Південна військово-морська база, Russian: Южная военно-морская база) was a naval base of the Armed Forces of Ukraine located in the town of Novoozerne (part of Yevpatoria city municipality) on Donuzlav Bay in the western part of Crimea.

[not verified in body] Donuzlav Bay is separated from the Black Sea by two sandspits which serve as a small freight port of the Yevpatoriya Commercial Trade Port located in the city.

[5] These actions violated the treaties of 1997 and are qualified as an act of aggression according to Article 3(e) of United Nations General Assembly Resolution 3314 (XXIX) on the Definition of Aggression of 1974:[6] The use of armed forces of one State which are within the territory of another State with the agreement of the receiving State, in contravention of the conditions provided for in the agreement or any extension of their presence in such territory beyond the termination of the agreement.During the night between 5 and 6 March 2014 ships of the Russian Black Sea Fleet, led by the Slava-class cruiser Moskva sank the decommissioned Russian Kara-class cruiser Ochakov and the rescue tugboat Shakhter at the entrance to Donuzlav Bay as blockships to prevent the Ukrainian fleet stationed at the Southern Naval Base from reaching the open sea.

[7][8][9] The following day the decommissioned diving support vessel BM-416 was also scuttled in the bay entrance.

[11] The surrendered Ukrainian ships included the corvette Vinnytsia, minesweepers Chernigov, Cherkasy [uk] and Genichesk [uk], medium landing ship Kirovograd, large landing ship Konstantin Olshansky, fire boat Evpatoria, transport Gorlovka, tugboats Kovel [uk] and Novoozernoe, patrol boat Feodosia, and torpedo boat Kherson.