Black Sea Drone Attacks Stoke Fears of Russian Probing of NATO Defenses

SOFIA, Bulgaria: A series of drone strikes targeting at least seven cargo vessels in the Black Sea off the coasts of NATO allies Romania and Bulgaria this month has prompted concerns within the alliance that Moscow may be deliberately escalating to probe Western resolve regarding support for Kyiv.

The incidents, occurring within the exclusive economic zones of both nations, endanger a vital global shipping corridor. They have resulted in multiple casualties, with at least two confirmed dead and dozens more missing, carrying the dangerous risk of dragging other nations directly into the conflict.

Throughout the conflict, sustained Russian strikes on Ukraine’s Black Sea and Danube river ports have forced Kyiv to seek alternative export corridors to deliver grain to Africa and the Middle East. These attacks have also repeatedly violated Romanian airspace near key Danube river ports.

In the most recent incidents, fires erupted on two separate vessels struck by drones on Wednesday and Thursday, with one of the incidents occurring within Romania’s territorial waters.

Speaking in Brussels on Thursday, Romanian President Nicusor Dan confirmed that “two drones” had struck the vessels, though he did not attribute ownership. “There will be a reaction from the Romanian state,” he asserted.

Suspicions increasingly point toward Russia. “There is no logical reason for Ukraine to attack its own vessels and crews when the outcome of such attacks solely benefits Moscow,” Bulgarian Prime Minister Rumen Radev told his nation’s parliament.

“The problem is that we cannot prove it,” Radev added.

Multiple vessels struck by drones in October

The San Marino-flagged chemical tanker Wine Trader, en route from Tunisia to Romania, was struck by a drone on Thursday and caught fire. While five crew members were rescued, seven others remain missing.

On Wednesday, the Comoros-flagged chemical and oil tanker Yara J, traveling from Turkiye to Romania, was also hit by a drone and caught fire. Romania’s acting Defense Minister, Radu Miruta, confirmed that an investigation into the incident is underway.

On Tuesday, two vessels were struck by drones off the Bulgarian coast. All 15 crew members were safely evacuated from the Ukraine-operated Chelsea 3, which was sailing under a Maltese flag. However, 11 crew members from the Guinea-Bissau-flagged HS Dignity remain missing.

The crew of the Chelsea 3 reported that the vessel’s deck and hull were struck by three aerial drones.

Earlier in the month, sea and aerial drones targeted two other commercial ships within Bulgaria’s exclusive economic zone. A Togo-flagged vessel sank with no trace of its 12 reported crew members, while 18 crew members were evacuated by a Bulgarian ferry from a damaged Palau-flagged ship.

A day prior, a Turkish-owned cargo vessel carrying corn caught fire after a drone attack and subsequently sank off the Romanian coast, resulting in two deaths and the rescue of 11 crew members. Ukrainian President Volodymyr Zelensky characterized the incident as “a horrific strike by two Russian drones on a civilian vessel” in neutral waters.

Russia’s ambassador to Sofia stated that she had no information regarding the incidents from the Russian defense ministry.

NATO’s defense clause under scrutiny

NATO Secretary-General Mark Rutte announced on X on Thursday that he had met with Radev and Dan to discuss Black Sea security and “the latest attacks on commercial shipping.”

“NATO has strengthened our posture along the eastern flank, including by enhancing our counter-drone capabilities,” he stated. “NATO will continue to work closely with our allies in the Black Sea, adjusting our deterrence and defense posture as necessary.”

While Article 5 of the NATO charter establishes a mutual defense guarantee—an attack on one is an attack on all—Romanian defense analyst Radu Tudor noted that its applicability to the recent Black Sea drone strikes remains uncertain, as the incidents occurred within the exclusive economic zones of alliance members.

“Whether the exclusive economic zone falls under the scope of an Article 5 response is a matter of ongoing debate,” he explained. “To date, it appears it has not, which has raised significant questions.”

Tudor argued that NATO’s response to the Black Sea incidents has been excessively slow.

“Tens of incidents are occurring while Russia steadily approaches NATO borders. Words are simply not enough,” Tudor asserted.

A growing threat

The Black Sea drone incidents in October represent the latest in a persistent series of drone airspace violations rocking Romania and other NATO members since the onset of Moscow’s full-scale invasion of Ukraine. While the majority of incursions originate from Russia, Ukrainian drones have also occasionally crossed into neighboring borders.

In August, Romania scrambled two F-16 fighter jets to neutralize an explosive-laden naval drone detected near a major Black Sea gas infrastructure project. Acting Defense Minister Miruta justified the deployment, stating it was necessary to “protect the lives of the several hundred people” working on the platform.

A source within Romania’s defense sector, speaking on condition of anonymity to The Associated Press, indicated that the attacks are economically motivated against Ukraine, asserting that “Romania is not the target right now.”

“All summer, we have been tracking all forms of drone debris—water drones, sea drones, aerial drones, and floating wreckage on the beaches,” the source noted. “If this pattern persists, some decisive action must be taken.”

Potential calls for an escort corridor

The source added that they have heard Turkiye intends to convene all riparian Black Sea states to plan a convoy escort mission through a militarized safe corridor.

“While I am uncertain about Turkish capabilities, our Romanian vessels currently lack anti-air defense systems to counter drones,” the source explained. “For military vessels to conduct such escorts would present an unacceptably high risk to the Navy.”

In July, Romania, Bulgaria, and Turkiye expanded their Black Sea Mine Countermeasures Task Force naval pact to include “the protection of critical submarine infrastructure,” according to Romania’s defense ministry. The agreement also established a permanent naval presence within Romania’s exclusive economic zone.

Many commercial vessels are flagged to one country while being owned by entities based elsewhere, complicating jurisdiction and response efforts.

“Why would Romania and Turkiye escort a vessel flagged in Bermuda, owned by an Argentinian company, merely to transport a few hundred tons of grain from Egypt?” the source questioned, highlighting the logistical and political complexities.

Bulgarian Defense Minister Dimitar Stoyanov announced on Wednesday that the country intends to join NATO’s Drone Edge project by the end of October. Launched in July, the joint initiative—which Romania has also joined—aims to invest over $40 billion in enhancing “counter-drone capabilities” over the next five years.

Cezar Gheorghe, founder of the grain consultancy firm Agricolumn, told The Associated Press that while the drone incidents have not halted trade at Romania’s key Black Sea port of Constanta, they have driven up insurance premiums across the broader Black Sea region.

“The premium for risk is rising. Any vessel transiting from Turkiye or the Bosphorus Strait to Constanta will face increased insurance costs,” he noted. Gheorghe’s primary concern remains a “serious incident” occurring at or near the port, recalling that in June, a Ukrainian maritime drone detonated at Constanta, with three others discovered nearby.

“It is a matter of time,” he concluded.

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