Ukrainian drones struck eight tankers from Russia's so-called "shadow fleet" that were delivering fuel to Crimea overnight, Kyiv's military said on Tuesday, part of a mounting effort to isolate the annexed peninsula.

Ukraine hit two Russian shadow fleet tankers in the Sea of Azov, exposing crypto payment networks using Bitcoin and stablecoins to evade Western sanctions.

Operators from Ukraine's Unmanned Systems Forces struck eight tankers belonging to Russia's so-called shadow fleet in the Sea of Azov on the night of 6-7 July.