Drone Strikes in Black Sea Leave One Ship Sunk and Crew Missing, Bulgaria Says

Bulgarian authorities have reported that a merchant vessel sank in the Black Sea following a drone attack, leaving its crew unaccounted for, while a second ship carrying grain was also struck in the same incident. The attacks occurred early Wednesday within Bulgaria's exclusive economic zone, according to statements from Prime Minister Rumen Radev.

The strikes mark a significant escalation in the ongoing maritime conflict tied to Russia's war in Ukraine, and they represent a rare direct hit on commercial shipping in waters that have, until now, largely escaped the worst of the Black Sea violence. The location of the attacks—roughly 70 miles off the eastern Bulgarian coastal town of Byala—places them well within territory that Bulgaria considers its economic domain.

Radev told reporters that both air and sea drones were deployed in the assaults, which took place at approximately 03:00 local time, or 23:00 GMT. The sunken vessel was flying the flag of Togo, a small West African nation whose maritime registry is often used for commercial shipping. It remains unclear how many crew members were aboard or what cargo the ship was carrying at the time of the attack.

A Bulgarian vessel that was nearby rushed to the scene but found only an overturned hull, scattered life rafts, and floating life jackets. No survivors from the sunken ship have been located, and a search operation is currently underway. The uncertainty surrounding the vessel's crew complement has added to the gravity of the situation, as families and maritime authorities await further information.

The second vessel, which was transporting grain, was also hit during the same attack window. Bulgarian sailors managed to rescue all 18 crew members from that ship, though two of them sustained injuries in a fire that broke out on board. According to Radev, the rescued crew consisted of eleven Turkish nationals and seven Indian citizens. The injured individuals have been sent for medical treatment.

Radev condemned the strikes in strong terms, describing them as "a flagrant violation of maritime law." He emphasized that an attack occurring within Bulgaria's exclusive economic zone is "absolutely unacceptable," signaling that Sofia views the incident as a direct affront to its sovereignty and maritime rights. Bulgaria's exclusive economic zone in the Black Sea spans just over 29,000 square kilometers—approximately 6% of the sea's total area—and grants the country special rights to explore and use marine resources.

The Bulgarian prime minister did not attribute responsibility for the attacks to any specific party. Moscow has yet to comment on the incident. The strikes come just one day after Ukrainian President Volodymyr Zelensky accused Russia of targeting a civilian vessel carrying corn, highlighting the increasingly dangerous environment for commercial shipping in the region.

The Black Sea has become a critical front in the broader conflict since Russia launched its full-scale invasion of Ukraine in February 2022. Both sides have relied heavily on drone warfare—both aerial and naval—to strike targets at sea and along coastlines. Ukraine has used domestically produced sea drones to devastating effect against Russia's Black Sea Fleet, while Russia has employed its own drone arsenal to target Ukrainian ports and shipping infrastructure.

A separate attack on Tuesday near the Ukrainian port city of Odesa resulted in one crew member being killed and seven others injured. That vessel was flying the flag of the Marshall Islands, according to Ukrainian media reports. The proximity of these incidents—both geographically and chronologically—suggests a sustained campaign against commercial shipping in the northwestern Black Sea.

The Kremlin has stated that it would intensify strikes across Ukraine in retaliation for comments Zelensky made earlier last week, in which the Ukrainian leader pledged to ramp up attacks on Russian oil refineries. This exchange has set the stage for a potentially broader escalation, with civilian and commercial maritime targets increasingly caught in the crossfire.

The involvement of Turkish and Indian crew members in the rescued vessel highlights the international dimensions of the Black Sea shipping trade. Turkey, which shares a maritime border with Bulgaria and controls the vital Bosphorus Strait, has maintained a delicate balancing act throughout the conflict, maintaining ties with both Kyiv and Moscow. The presence of Turkish sailors on a struck vessel may add diplomatic pressure on Ankara to respond.

For Bulgaria, a NATO member state, the attack raises uncomfortable questions about the security of its territorial waters and the alliance's ability to protect commercial shipping in the Black Sea. While NATO has increased its naval presence in the region since 2022, the vast expanse of the Black Sea makes comprehensive protection difficult. The use of relatively inexpensive drone technology further complicates defensive efforts, as these weapons can be deployed in swarms and are difficult to detect and intercept.

Maritime law experts note that attacks on commercial vessels in peacetime or outside declared war zones constitute a serious violation of international norms. The United Nations Convention on the Law of the Sea guarantees freedom of navigation and protects civilian shipping from military attack. However, enforcement mechanisms in the Black Sea remain weak, particularly when the identity of the attacker is unclear.

The incident also raises concerns about the safety of grain exports from the region. Ukraine has struggled to maintain its grain shipping routes since Russia withdrew from the Black Sea Grain Initiative in 2023. The presence of a grain-carrying vessel among the targeted ships underscores the risks faced by global food supply chains that depend on Black Sea exports.

Insurance premiums for vessels operating in the Black Sea have already soared since the war began, and Wednesday's attacks are likely to push them higher. Shipping companies may become increasingly reluctant to send vessels into the region, potentially exacerbating global food security concerns. The sunken Togo-flagged vessel serves as a stark reminder of the human cost, with its missing crew members still unaccounted for as search efforts continue.

As Bulgarian authorities investigate the attacks, the broader international community faces pressing questions about how to protect commercial shipping in a conflict zone where drone warfare is rewriting the rules of engagement. The answers may come too late for the missing sailors.