The Ukrainian military claimed today that its operations were working the destruction of a total of 15 Russian warships navy in Black Sea from the start of the Russian invasion and whatnot 12 boats were damaged.

Ukraine has stepped up its attacks in the Black Sea and Crimea, which Russia annexed in 2014. This fall, Kiev has announced a series of attacks on warships, including a large amphibious assault ship and a submarine, in the region.

“You can count the ones that have already been put out of business. There are 15 destroyed ships and 12 with damage. Not all disasters are the result of the use of drones, but they have many damaged ships to their credit,” explained Navy spokesman Dmytro Pletenchuk speaking on public television. He even called Ukraine a “pioneer in a new kind of naval war, because of which Russia was forced to move its naval forces to positions that are difficult for Kiev to hit” with the capabilities it has today.

Russia also faces logistical problems, he said, because he has to take ships to Novorossiysk and, intermittently, to Tuapse, two ports in southeastern Crimea, farther from Ukraine.

Reuters was unable to independently verify this information. Russia does not usually announce damage to its military assets and says it is repelling most Ukrainian attacks.

The Ukrainian military says its operations in the Black Sea so far include strikes on the Russian Navy’s headquarters in Sevastopol and the Kerch shipyard, where a vessel that had not yet joined the Black Sea fleet was destroyed.