Ukrainian naval drones hit two sanctioned tankers in the Black Sea as they headed to a Russian port to load up with oil destined for foreign markets, an official said on Saturday, as Kyiv tries to pile pressure on Russia's vast oil industry.

The two oil tankers identified as the Kairos and Virat were empty and sailing to Novorossiysk, a major Russian Black Sea oil terminal, the official at the Security Service of Ukraine told Reuters.

Naval drones could be seen speeding towards hulking tankers followed by powerful explosions that caused fires on the vessels, video footage shared by the official showed.

:Reuters could not independently verify the identity of the tankers in the clips or the location and date of the footage.

"Video shows that after being hit, both tankers sustained critic

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