.WHEN RUSSIA penetrated in February 2022 Ukraine barely had a naval force. The defenders scuttled their one frigate to avoid Russia coming from seizing it. Two years later Ukraine is having a hard time to hold off a Russian onslaught on land-- but it is gaining the war in the Black Ocean and also has broken the Russian clog of its grain ships. Its own triumphes have typically depended on fast technological development: intermittent navy depends on crewed ships to overcome, however Ukraine has actually constructed a squadron of drone watercrafts, or uncrewed surface motor vehicles (USVs). How are they forming the battle at sea?