Near the city of Sevastopol, where the Russian Navy's Black Sea Fleet is headquartered.
Russian authorities on the occupied Crimean Peninsula claimed to have sunk an unmanned surface vehicle (USV).
Photos of what seems to be the marine drone in issue, with characteristics that suggest it is an unmanned.
Explosive-laden suicide boat, have surfaced on social media.
One of the photographs seems to show a Russian Navy Project 775 Ropucha class heavy landing ship in the backdrop.
Supporting claims that it was taken in the vicinity of Sevastopol.