French and US maritime patrol planes are watching the western Black Sea, where drones keep hitting merchant ships, Romanian outlet Curs de Guvernare reported on 19 October, citing flight-tracking data. Romania blames Russia for the attacks, while Bulgaria says it cannot prove who launched them.

Ukraine’s three small Danube ports have kept its grain exports from collapsing further, and Russia has pounded those ports since the summer. The ships serving them are now being hit in the economic zones of two NATO members. Many were anchored near or heading to the Sulina Canal, which links the Danube to the sea. That puts the allied patrols over these waters in the middle of the fight over Ukraine’s grain trade.

Two patrol planes over the western Black Sea

A French Navy Atlantique 2 maritime patrol plane arrived in Constanța, Romania’s main Black Sea port, on the evening of 18 October, Curs de Guvernare said. On 24 October, French Foreign Minister Jean-Noël Barrot said in the Bulgarian port of Varna that a French patrol plane had been operating in the area under NATO for two weeks and had contributed to rescue operations.

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Meanwhile, a US Navy P-8A Poseidon flew into Varna from Sicily on 18 October, AFP reported, citing flight-tracking data. Two days later, Bulgarian Prime Minister Rumen Radev said it had begun reconnaissance patrols after Sofia asked allies for help, and that some allies had responded quickly. Bulgarian Defense Minister Dimitar Stoyanov called the deployment a joint decision of Bulgaria and NATO. He said the plane cannot strike targets and passes its data to NATO, Anadolu Agency reported.

NATO promises more

On 20 October, NATO’s North Atlantic Council met at Romania’s request. Afterward, the alliance said it would send more maritime patrol aircraft, radar systems, and drones to the Black Sea. NATO military spokesman Col. Martin O’Donnell added that allies have sent or will send intelligence personnel and explosives-forensics teams. NATO itself has not attributed the attacks to any country.

Romania names Russia, Bulgaria hedges

Romania has been blunter. On 15 October, after four merchant ships were hit within a day, acting Foreign Minister Oana Țoiu wrote on X that “Russia bears full responsibility for these developments.” On 17 October, Romanian F-16s shot down two jet-powered Russian Geran drones near Sulina, Romania’s Defense Ministry said.

On 23 October, a drone sank the cargo ship Khoryv off Constanța, killing a Ukrainian sailor, and President Nicușor Dan blamed Russia too. “It is part of Russia’s escalation process in its war in Ukraine,” Dan said.

Bulgaria is more cautious. Radev told parliament on 14 October that the attacks worked in Russia’s favor but that Sofia could not prove it. Since taking office in May, he has sought a thaw in ties with Moscow.

Drones sank two merchant ships and set a third on fire in the Black Sea economic zones of NATO members Romania and Bulgaria on 5 and 6 October, killing at least two seafarers, Romanian and Bulgarian authorities reported. Ukraine blamed Russia for the first attack. Neither Bucharest nor Sofia has said who launched the drones.

Russia has spent months striking ships bound to and from Ukrainian ports while denying responsibility or staying silent. Now merchant vessels are sinking inside NATO members' economic zones without either government naming the attacker, so Moscow pays no political price for hitting allied waters.

Grain ship sinks off Romania

The Royad Mammadov, a Turkish-owned ship carrying grain from Ukraine's port of Izmail to Italy, sank on 5 October near Romania's Pescăruș offshore platform, 20 nautical miles from the Romanian coast, Digi24 reported. The Romanian Naval Authority described the incident as a fire on board. Romania's Interior Ministry said 11 crew members were rescued and two people died.

Three injured sailors aged 22 to 50 were taken to the Constanța county hospital, conscious and stable, with multiple injuries. Adrian Mihălcioiu, the leader of Romania's Free Seafarers' Union, said the ship was attacked by Russian sea and aerial drones in waters Romanians consider safe.

"It is a commercial ship, a ship that is not part of the war… people who have nothing to do with the war, it is not their war," he said.

Ukrainian President Volodymyr Zelenskyy blamed the attack on "two Russian drones" and said the ship was in neutral waters carrying corn. Citizens of Azerbaijan and India were on board, and the captain was killed, he said. Romanian authorities have not attributed the sinking to Russia.

Two more ships hit in Bulgaria's zone

A day later, drones struck two merchant ships in Bulgaria's exclusive economic zone east of the town of Byala, the first known attack on ships there, Maritime.bg reported. The Togo-flagged Alfa Watan, sailing from Al-Arish, Egypt, to Sulina, Romania, suffered critical hull damage and sank, Militarnyi said. The Bulgarian ferry Dioscuria found only an overturned lifeboat and life jackets at the scene, and the search for the crew continues, Euronews reported.

The Palau-flagged Able, sailing from Galați, Romania, to Istanbul, caught fire, and the Dioscuria rescued its 18 crew members. Both ships are Turkish-owned, Türkiye Today reported. Two sailors with severe injuries were flown to a hospital in Varna, Prime Minister Rumen Radev said, according to AP. Sea and aerial drones hit the ships at about 3 a.m., he said, calling the attack "a blatant violation of international law and maritime law."

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Radev called an emergency meeting of four ministries, the presidency, and the security services. No one from the Alfa Watan has been found, he said, warning that if the war is not ended in time, it "will continue to expand its spatial scope." The origin of the drones is still being clarified, Maritime.bg said. Several Bulgarian media outlets cited sources as saying the drones were Russian, Sofia Globe reported.

Russia's war on Black Sea shipping

Russia had already killed the captain of a Tanzanian-flagged ship in September, and days later it struck another civilian vessel, killing its captain too. Ukraine says that route carries 90% of its farm exports.

Romania has destroyed a sea drone near its Neptun Deep gas project and found Russian drones floating in its economic zone. In September, ISW linked drone crashes in Romania and Moldova to a wider Russian pattern of pressure on NATO.

EU foreign policy chief Kaja Kallas called for a moratorium on Black Sea attacks. Turkish President Recep Tayyip Erdoğan said Ankara was stepping up diplomacy to restore grain exports. Türkiye and the UN are organizing new Black Sea truce talks between Russia and Ukraine, Bloomberg reported, citing a diplomat. Russia earlier dismissed Kyiv's offer of a Black Sea ceasefire.