.WHEN RUSSIA occupied in February 2022 Ukraine rarely had a navy. The defenders scuttled their one frigate to avoid Russia from seizing it. Pair of years later Ukraine is straining to keep back a Russian offensive on land-- but it is actually winning the battle in the Black Ocean and also has cracked the Russian clog of its grain ships. Its own triumphes have usually depended on fast technological advancement: intermittent naval force relies upon crewed ships to fight, however Ukraine has constructed a fleet of drone boats, or even uncrewed surface area cars (USVs). Just how are they molding the battle mixed-up?