Two ships have been hit in drone attacks off BulgariaâÂÂs Black Sea coast, with one of them sinking, Prime Minister Rumen Radev said.
The Ukrainian-owned Chelsea 3, which was sailing under a Maltese flag, was hit by three drones and damaged about 18 nautical miles (33km) off Bulgaria at about 1.30am on Tuesday (22:30 GMT on Monday), Radev said.
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Radev said its 15-man crew, seven of them Ukrainians and eight Azerbaijanis, was rescued. Five crew members received medical assistance, and no one was seriously injured.
He added that one crew member from the ship that sank was also rescued.
Radev called the incident âÂÂabsolutely unacceptableâÂÂ.
âÂÂAnother attack in the immediate vicinity of Bulgarian territorial waters,â he said in a televised address, adding, âÂÂI am due to speak with NATO Secretary-General Mark Rutte.âÂÂ
Radev said there was no clear evidence of who carried out the attack, but âÂÂthe outcome benefitsâ Russia and that the Russian ambassador would be summoned over the incident.
As a member of the NATO military alliance, Bulgaria holds a strategic position on the Black Sea, where Russia and Ukraine have vital ports.
The incident comes as concerns grow over hybrid attacks involving Russia.
Last week, drones hit two ships off BulgariaâÂÂs Black Sea coast, causing one to sink. All 10 crew members from the ship that sank remain unaccounted for.