Ukrainian underwater drones have struck two tankers belonging to Russia’s so-called shadow fleet in the Black Sea, according to an official in Ukraine’s security services (SBU).

The two oil tankers, identified as the Kairos and Virat, were empty and sailing to Novorossiysk, a major Russian Black Sea oil terminal.

Ukraine has used Sea Baby naval drones to strike two Russian oil tankers in the Black Sea. An official from Ukraine’s security services told The Associated Press about the attack on Saturday.

A push by the Trump administration to end Russia's war on Ukraine appears to make headway, with Kyiv saying Zelenskyy could visit D.C. within days to finalize a deal.

In Russia, a major oil terminal near the port of Novorossiysk stopped operations Saturday after a strike by unmanned boats damaged one of its three mooring points, according to a statement from the Caspian Pipeline Consortium, which owns the terminal.

A Putin ally has called for more detail in Trump's peace plan for Ukraine. Follow Newsweek's live coverage of the war.

Russian drone and missile attacks on Kyiv killed at least two people and wounded 15 Saturday, officials said, as renewed U.S.-led peace negotiations gathered momentum.