Deadly Drone Strikes Turn the Black Sea Into a War Zone for Merchant Ships

A wave of drone strikes against merchant ships has turned the western Black Sea into one of the most dangerous stretches of water for commercial crews. Between October 5 and October 15, 2026, at least seven cargo ships and tankers were hit off the coasts of Romania and Bulgaria, two NATO and EU members, and three of them sank. Around 30 seafarers have been killed or remain missing. EU foreign policy chief Kaja Kallas described the six attacks recorded in ten days as a dangerous and unacceptable escalation, and NATO is now sending extra surveillance assets to the region.

The series began on Monday, October 5, when a Turkish-owned bulk carrier loaded with corn was struck by aerial and sea drones inside Romania's exclusive economic zone, roughly 20 miles from the Romanian shore and close to the Pescarus offshore gas platform. The vessel had left the Ukrainian Danube port of Izmail a few hours earlier and was heading to Ravenna in Italy. Fire spread on board and the ship eventually sank. Two crew members died, one was reported missing, and 11 sailors were rescued by Romanian vessels and helicopters. Ukrainian President Volodymyr Zelensky blamed Russian drones for the strike.

A few hours later, in the early morning of October 6, two Turkish-managed bulk carriers were hit inside Bulgaria's exclusive economic zone, about 80 nautical miles east of the coastal town of Byala. The distress beacon of the Togo-flagged Alfa Watan was received at 02:54, followed at 03:23 by an alert from the Palau-flagged Able. The Alfa Watan sank and Bulgarian rescuers found only an overturned lifeboat and life jackets. Its ten crew members, nine Syrians and one Egyptian, were never found, and Bulgaria called off the search the same evening, a decision later questioned by Damascus. The 18 Turkish and Indian sailors of the Able were picked up by the Bulgarian ferry Dioscuria and brought to Varna. Prime Minister Rumen Radev called the attack absolutely unacceptable and said the nature of the cargo and the direction of the ships pointed toward Russia as the beneficiary.

The second blow off Bulgaria came overnight on October 13. The Ukrainian-owned, Malta-flagged general cargo ship Chelsea 3 was hit by three aerial drones about 18 nautical miles east of Byala. All 15 crew members, seven Ukrainians and eight Azerbaijanis, were rescued, and the damaged vessel was later moved to the port of Burgas so that investigators could recover drone fragments. Shortly afterwards, the Guinea-Bissau-flagged cargo ship HS Dignity, bound for the Romanian Danube port of Braila, was struck and sank 17 nautical miles east of the town of Krapets. Five sailors were rescued and 11 remain missing. Sofia summoned the Russian ambassador and opened a war crimes investigation.

Romania was hit next. On the evening of October 14, the Comoros-flagged chemical tanker Yara J was struck while at anchor near the entrance of the Sulina Canal, the gateway to the Danube corridor used by Ukrainian grain exports. The crew of 17 put out the fire without outside help and the ship sailed to Constanta. At around 07:00 on October 15, the San Marino-flagged product tanker Wine Trader, which was empty and waiting to load vegetable oil from Moldova, reported a hit on its accommodation block about 13 nautical miles off Sulina. The captain later reported a second and possibly a third impact. A Romanian helicopter evacuated five survivors in heavy seas, but seven crew members are still missing. Romanian officials said these were the first drone strikes on ships inside the country's territorial waters, as previous incidents had occurred further out in the exclusive economic zone. San Marino advised its fleet to avoid the Black Sea and the Sea of Azov until further notice.

No government has formally named the attacker. Russia denies responsibility for the strikes off Romania and Bulgaria, and NATO has not attributed them. However, Romania's foreign minister holds Moscow fully responsible, Kyiv blames Russia, and defence analysts link the campaign to Russian hybrid warfare aimed at Ukraine's agricultural exports. Several of the hits combined aerial drones with explosive surface drone boats, a tactic that leaves crews of small vessels very little time to escape.

The escalation is also the result of a two-way maritime war. Since early July 2026, Ukraine's Unmanned Systems Forces have run a large campaign against Russia's so-called shadow fleet, the tankers and cargo ships used to move Russian oil and goods despite Western sanctions. By late September, Ukrainian commanders claimed to have disabled around 300 vessels, mostly in the Sea of Azov and the eastern Black Sea. On October 6, the sanctioned, fully loaded Aframax tanker Rio caught fire near the Russian resort city of Sochi after a reported sea drone strike and was left drifting along the coast. In August, a major Ukrainian drone and missile raid on Novorossiysk damaged Black Sea Fleet warships and temporarily put two grain terminals out of action, and Greek-owned ships calling at Russian ports were also hit. Moscow has answered with strikes on ships heading to Ukrainian ports. On October 15, the Russian defence ministry claimed hits on two cargo ships approaching Odesa, and on October 20 it said it had struck three vessels at the Ukrainian Danube port of Reni and two more sailing toward Odesa, claiming they carried military supplies.

The security situation keeps deteriorating near NATO territory. Over the weekend of October 17 and 18, Romanian F-16 fighter jets shot down two drones that had approached the country's airspace from the Black Sea. On October 20, a US Navy P-8 Poseidon maritime patrol aircraft started reconnaissance flights over the Black Sea at Bulgaria's request. The same day, ambassadors of the 32 allies met in the North Atlantic Council in Brussels. NATO announced that allies have sent or will send additional maritime patrol aircraft, radar systems, drones, intelligence personnel and explosive investigation teams to the region. Allied specialists are also expected to help analyse the debris recovered from the Chelsea 3. Romania and Bulgaria are pushing for stronger counter-drone defences and new safety protocols for merchant ships, while the question of how NATO can protect civilian vessels outside allied territorial waters remains open.

For supply chains, the main effect so far is a sharp rise in risk and cost rather than a closure of trade routes. On September 16, the London market's Joint War Committee extended its high-risk listed area to cover almost the entire Black Sea, which means that voyages to the Danube ports of Galati and Braila, as well as routes to Georgia, now require separate war risk cover in many cases. The maritime security firm Ambrey recorded more than 210 strikes on commercial vessels in the Black Sea between July and the end of September and expects these conditions to persist until the end of 2026. With hull and cargo underwriters reassessing their exposure in the western Black Sea, shipowners face higher premiums and some may simply refuse to send ships to the region.

The most exposed flow is Ukrainian agricultural exports. The Black Sea corridor and the Danube route through Sulina carry most of Ukraine's wheat, corn and vegetable oil to buyers in Europe, the Middle East and North Africa. Ukrainian grain shipments had already dropped by 76% in the first half of August compared with a year earlier, and Kallas said on October 20 that Ukraine is losing around 60 million euros of export revenue every day because of Russian attacks. Russian grain and oil flows through Novorossiysk and the Caspian Pipeline Consortium terminal are also vulnerable to Ukrainian strikes, which puts pressure on world wheat prices whenever a terminal is hit.

For now, ports on the NATO side keep operating. Bulgarian authorities report no drop in traffic at Varna and Burgas, and grain traders say activity at Constanta has not been significantly affected, with insurance costs as their main concern. The situation remains fragile.