.WHEN RUSSIA penetrated in February 2022 Ukraine barely had a navy. The guardians scuttled their one frigate to avoid Russia from seizing it. Two years later Ukraine is actually struggling to hold off a Russian onslaught ashore-- but it is gaining the battle in the Black Sea as well as has cracked the Russian blockade of its own grain ships. Its own triumphes have actually often depended on rapid technological innovation: every other naval force relies upon crewed ships to fight, but Ukraine has actually developed a line of drone boats, or even uncrewed surface cars (USVs). Exactly how are they forming the battle at sea?