Drone Strikes in Black Sea Raise Fears of Russian Escalation

A series of drone attacks on at least seven cargo vessels in the Black Sea this month, near the coasts of NATO members Romania and Bulgaria, have led to speculation among alliance members about whether Russian President Vladimir Putin is seeking to escalate the conflict and test NATO's support for Ukraine.

The attacks, which have occurred within the exclusive economic zones of Romania and Bulgaria, threaten a vital global shipping route and have resulted in at least two deaths with approximately 25 individuals still missing. These incidents also carry the risk of drawing other nations directly into the war in Ukraine.

Throughout the conflict, Russia has consistently targeted Ukraine's Black Sea and Danube river ports, increasingly forcing Kyiv to rely on alternative routes for its grain exports. Russian drones have also repeatedly violated Romanian airspace near some of Ukraine's Danube ports.

In the most recent events, two ships caught fire after being struck by drones on Wednesday and Thursday, with one incident occurring in Romanian territorial waters. Romanian President Nicusor Dan confirmed that two drones had hit the vessels, though he did not attribute responsibility. He stated that the Romanian state would respond.

Bulgarian Prime Minister Rumen Radev indicated that suspicion increasingly falls on Russia. "There is no logic in Ukraine attacking its own ships and crews, given that the outcome of all these attacks favors Russia — and indeed, the logic points in that direction," Radev told Bulgaria's Parliament, while acknowledging the difficulty in proving such claims.

The San Marino-flagged chemical tanker Wine Trader, en route from Tunisia to Romania, was struck by a drone on Thursday, causing a fire. Five crew members were rescued, but seven remain missing. On Wednesday, a drone strike and subsequent fire were reported on the Comoros-flagged Yara J, a chemical and oil tanker traveling from Turkey to Romania. Romania's acting Defense Minister Radu Miruta announced an investigation into the incident.

Earlier in the week, two ships were targeted by drones off Bulgaria's coast. Rescuers evacuated all 15 crew members from the Ukraine-operated Chelsea 3, sailing under a Maltese flag, but 11 crew from the Guinea-Bissau-flagged HS Dignity are still unaccounted for. The crew of the Chelsea 3 reported that the ship's deck and hull were hit by three aerial drones.

At the beginning of October, sea and aerial drones attacked two other commercial vessels in Bulgaria's exclusive economic zone. One Togo-flagged ship sank with all 12 sailors on board presumed lost, while a Bulgarian ferry rescued 18 crew members from a damaged Palau-flagged vessel. A day prior, a Turkish-owned cargo ship carrying corn caught fire and later sank off the Romanian coast following a drone attack. Two fatalities were confirmed, and 11 crew members were rescued. Ukrainian President Volodymyr Zelenskyy described this incident as a "horrific strike by two Russian drones on a civilian vessel" in neutral waters.

Russia's ambassador in Sofia, Bulgaria, stated she had no information from the Russian defense ministry regarding the attacks. NATO Secretary-General Mark Rutte confirmed discussions with the leaders of Romania and Bulgaria regarding Black Sea security and the recent attacks on commercial shipping. He noted that NATO has enhanced its posture along the eastern flank, including increased counter-drone capabilities, and will continue to adapt its deterrence and defense posture.

The applicability of Article 5 of the NATO charter, which establishes a mutual defense guarantee, to drone strikes in exclusive economic zones remains a subject of discussion. Defense analysts have noted that it is unclear whether these zones are covered by an Article 5-type reaction, raising questions about the alliance's response.

These Black Sea drone incidents follow a pattern of airspace incursions by drones affecting Romania and other NATO members since Russia's full-scale invasion of Ukraine. While most incursions have been attributed to Russia, Ukrainian drones have also crossed borders.

In August, Romania intercepted and destroyed a naval drone carrying explosives near a major Black Sea gas project. A source within Romania's defense sector, speaking anonymously, suggested that the attacks are aimed at harming Ukraine economically rather than targeting Romania directly. They expressed concern about the ongoing drone activity and the potential need for intervention.

Discussions have reportedly occurred about Turkey potentially convening Black Sea riparian states to plan a mission to escort convoys through a militarized safe corridor. However, concerns have been raised about the capacity of Romanian vessels to provide adequate anti-air defense against drones during such escorts.

In July, Romania, Bulgaria, and Turkey expanded their Black Sea Mine Countermeasures Task Force naval pact to include the protection of critical submarine infrastructure, involving a permanent naval presence in Romania's exclusive economic zone.

Despite the drone incidents, trade at Romania's Black Sea port of Constanta has not been negatively impacted, according to grain consultancy firm Agricolumn. The primary concern is the rising cost of insurance premiums for maritime traffic in the broader Black Sea region. The firm's founder noted that a "serious incident" occurring at or near Constanta is a significant worry, recalling a Ukrainian maritime drone explosion at the port in June.