Five ships have now been attacked in the exclusive economic zones of NATO member countries, according to the report, and Bulgaria has asked the alliance to redeploy anti-drone defenses as a result.
The latest incident took place on October 13, when suspected Russian drone strikes sank one cargo ship and forced the evacuation of another vessel. One of the ships hit was the Ukrainian-operated coastal freighter Chelsea 3, which sails under the Maltese flag. All 15 crew members were safely evacuated by Bulgarian rescue operations after the ship was reportedly struck by three aerial drones.
The report notes there is no hard proof the attacks originated from Russia. Bulgarian Prime Minister Rumen Radev told the Russian ambassador in Sofia that "it makes no sense for Ukraine to destroy its own ships in the Black Sea, and the results of these strikes favor Russia's interests," according to the Associated Press.