.WHEN RUSSIA invaded in February 2022 Ukraine rarely had a naval force. The defenders scuttled their one frigate to prevent Russia coming from seizing it. Two years later on Ukraine is actually battling to keep back a Russian offensive on land-- but it is succeeding the battle in the Black Sea and also has broken the Russian clog of its surface ships. Its success have often depended on fast technological innovation: every other navy relies on crewed ships to eliminate, but Ukraine has actually developed a fleet of drone watercrafts, or uncrewed surface area motor vehicles (USVs). How are they forming the war at sea?