Ukraine has hit an empty oil tanker of Russia’s shadow fleet in the Mediterranean in the first such drone attack in this sea in another escalation of the Ukrainian strikes on Russian vessels. The Qendil tanker, flying the flag of Oman, was targeted and hit by drones, Ukraine said on Friday. The vessel was empty, and its blow-up does not pose an environmental threat, sources with knowledge of the matter told Bloomberg. Ukraine has stepped up drone attacks on empty vessels of the Russian shadow fleet in recent weeks. …