Derry Baskaran

Ukraine's security forces used underwater drones to hit the oil tankers, which were flying under Gambian flags.

While the ship sustained damage, no casualties were reported.

One attack was just 35 nautical miles off the Turkish coast.

A Turkish foreign ministry spokesperson posted on social media that the attacks were carried out within Turkey's exclusive economic zone.

He said Turkey will continue talks with relevant parties to prevent the spread of war across the Black Sea.

Overnight in Ukraine, four people were killed and 31 injured in Russian strikes.

A Ukrainian delegation is in Washington today meeting with U.S.

negotiators to discuss peace talks.

For NPR News, I'm Derry Bouskeren, Istanbul.