Greece's Foreign Ministry has "unequivocally" condemned the recent drone attacks on commercial ships near Bulgaria's coast, which it said endanger lives and threaten maritime security in the Black Sea.
In a post on X, the ministry said respect for international law, including the law of the sea, is fundamental. It expressed solidarity with Bulgaria, praised the rescue services' quick response and called for those responsible to be held accountable.
It did not name a culprit.
The statement follows strikes on two vessels off Bulgaria. Bulgarian Prime Minister Rumen Radev said drones sank the Guinea-Bissau-flagged cargo ship Dignity and hit the Ukrainian-owned Chelsea 3.
Five sailors were rescued, and 11 crew members were reported missing. A week earlier, drones attacked two other ships in Bulgaria's waters, sinking one.
Bulgaria summoned the Russian ambassador, though Bulgarian authorities say they have no clear evidence of who carried out the attacks.
European Commission President Ursula von der Leyen said the Black Sea has become "another front of escalation of the Russian war in Ukraine." Ukraine blamed Russia. Moscow has not commented in the reports reviewed.
Mr. Radev called the attacks "absolutely unacceptable" and is seeking help from NATO and the EU, as well as talks with Romania and Turkey on shipping safety.
Athens has close ties with Sofia.
Mr. Radev was in Thessaloniki on Oct. 3 for a ceremony with Prime Minister Kyriakos Mitsotakis marking the exchange of relics and remains.
Greece also holds the U.N. Security Council presidency this month, and last week backed Ukraine's call for a council meeting on Russian strikes.