.WHEN RUSSIA invaded in February 2022 Ukraine hardly had a naval force. The defenders scuttled their one frigate to avoid Russia coming from seizing it. Two years later on Ukraine is battling to keep back a Russian onslaught ashore-- yet it is actually gaining the war in the Black Ocean and has cracked the Russian blockade of its own surface ships. Its triumphes have actually often depended upon rapid technological advancement: intermittent naval force counts on crewed ships to fight, however Ukraine has developed a line of drone watercrafts, or uncrewed surface area motor vehicles (USVs). How are they shaping the battle at sea?