Five "shadow tankers" used to transport sanctioned Russian oil have been attacked in the last three months - four in the Mediterranean, and one in the Baltic Sea. The Baltic Sea one was confirmed as a limpet mine, and it's likely that the others also used this method. Having driven the Russian fleet out of the Black Sea, it seems that the country without a navy is successfully expanding its attacks on shipping with a Russian connection. Refineries, storage tanks and now shipping, the Ukrainian branch of Just Stop (Russian) Oil doesn't mess about.