GeoConfirmed, a volunteer group documenting Russia’s war against Ukraine, has released video footage of naval drones attacking Russian Black Sea Fleet ships in Sevastopol on the Crimean peninsula, which Russia illegally annexed in 2014.

One of the published videos shows an alleged attack on a Russian frigate of the Admiral Hryhorovich type, and “only the Admiral Makarov corresponds to this class,” the volunteer group says.

The Admiral Makarov frigate is the most important Russian warship in the Black Sea after the sinking of the Moskva.

GeoConfirmed also claims that the footage stops when the drone crashes into the ship, which presumably exploded.

And ISW on Sunday, in its latest analysis of the conflict provoked by Russia in Ukraine, reported that the target of the Sevastopol drone strike was an Admiral Hryhorovych-type frigate.

Another video shows an attack on a “Russian Natiya-class minesweeper.” According to GeoConfirmed, 6-8 naval drones were used to attack the Russian fleet.

On Saturday, the Ministry of Defense of Russia accused Ukraine of sending nine drones to Sevastopol.

The ministry said its minesweeper and dam suffered minor damage in the attack and that its forces shot down all the drones.

Ukraine has not claimed responsibility for the drone attack in Sevastopol.

Saturday’s attack comes two months after the Russian naval headquarters in Sevastopol came under repeated drone attacks in July and August that damaged Russian naval buildings.