Russia's defence ministry said on Wednesday that its forces had destroyed what it described as Ukraine's "last warship" two days ago in the port of Odesa in a missile strike.
Ukraine's navy declined to comment.
"The last warship of the Ukrainian navy, the Yuriy Olefirenko, was destroyed at a warship mooring in the port of Odesa," Defence Ministry Spokesman Igor Konashenkov said in a daily briefing on the war.