Two merchant ships struck by drones off Bulgaria's Black Sea coast

Two merchant ships were hit by drones near Bulgaria's Black Sea coast on Tuesday. One vessel sank. The other, the Chelsea 3, was struck by three drones around 1:30 in the morning. All 15 crew members were brought safely to the port of Varna, though five needed medical treatment. One crew member from the second ship was rescued. Bulgarian Prime Minister Rumen Radev called the attack "absolutely unacceptable" and said it was the second such incident in a week. He met with Russia's ambassador and spoke with NATO's leader, Mark Rutte. Radev said there is no firm proof of who is responsible, but that Russia appears to benefit from the attack. Bulgaria is asking for international help to investigate and improve security in the area.