.WHEN RUSSIA occupied in February 2022 Ukraine rarely possessed a navy. The defenders scuttled their one frigate to avoid Russia from seizing it. Two years later Ukraine is actually struggling to keep back a Russian aggression ashore-- but it is actually succeeding the war Sea and also has actually broken the Russian clog of its grain ships. Its triumphes have often relied on quick technological innovation: every other navy relies on crewed ships to fight, but Ukraine has developed a line of drone watercrafts, or uncrewed surface area vehicles (USVs). How are they forming the battle at sea?