Bulgarian Prime Minister Rumen Radev stated that a drone attack off Bulgaria's Black Sea coast on Tuesday at about 1:30 am (22:30 GMT on Monday) resulted in one ship sinking and another, the Ukrainian-owned Chelsea 3, sustaining damage. All 15 crew members from the Chelsea 3 were rescued, with five receiving medical assistance for minor injuries. One crew member from the sunken ship was also rescued. Radev called the incident "absolutely unacceptable" and plans to speak with NATO Secretary-General Mark Rutte, adding that while there is no clear evidence of who carried out the attack, "the outcome benefits" Russia, and the Russian ambassador will be summoned. This follows a similar attack last week that also sank a ship, leaving 10 crew members unaccounted for.