Drone strikes against merchant vessels off Bulgaria have brought Russia’s war into waters bordering NATO and the European Union. With grain exports threatened, shipping costs rising and Sofia seeking allied protection, Moscow’s campaign against maritime trade risks becoming another instrument of economic and political pressure.

Russia’s expanding campaign against commercial shipping in the Black Sea is creating a security crisis that extends far beyond Ukraine. The latest drone attacks off Bulgaria’s coast have left 11 sailors missing, forced Sofia to seek assistance from NATO and the European Union, and raised concerns that Moscow is attempting to disrupt one of the world’s principal agricultural export routes.

On 13th October, the Guinea-Bissau-flagged HS Dignity sank after being struck by drones approximately 17 nautical miles east of the Bulgarian village of Krapets. Another vessel, the Ukrainian-owned, Maltese-flagged Chelsea 3, was attacked near Byala. All 15 crew members were rescued, although five sustained minor injuries. The incidents followed earlier attacks in Bulgaria’s exclusive economic zone on 6th October, when the ALFA WATAN sank and the grain-carrying ABLE was damaged.

The significance lies not simply in the destruction of merchant vessels but in the geographical expansion of the threat. Commercial routes previously regarded as comparatively safer alternatives to Ukraine’s exposed ports are now becoming operationally dangerous. Bulgaria and Romania, both NATO and EU members, face disruption to trade, maritime insurance and port operations as the conflict spreads across the western Black Sea.

Russia’s Campaign Against Maritime Trade

The latest attacks follow months of Russian strikes against Ukrainian ports, export terminals and civilian shipping. As EU Today previously reported, repeated attacks on Odesa have already reduced Ukraine’s grain-export capacity, while alternative routes through the Danube and neighbouring European countries cannot fully replace its major Black Sea terminals.

The extension of attacks towards Bulgaria changes the economic calculation. Ships carrying agricultural products, those approaching Danube ports and vessels operating between Black Sea countries now face greater uncertainty, regardless of whether they enter Ukrainian territorial waters.

Maritime security company Ambrey assessed the earlier October attacks as highly likely to have been conducted by Russian forces. Its assessment identified vessels associated with Ukrainian grain trade as the principal targets, rather than suggesting that every commercial ship was being attacked indiscriminately.

This distinction is important, but it offers little reassurance to international shipping companies. A campaign directed against Ukrainian trade can disrupt the wider maritime economy when insurers, shipowners and exporters cannot establish which routes remain safe.

The economic consequences are already becoming apparent. Shipowners must consider higher insurance premiums, additional security measures and the possibility of losing vessels and crews. Traders may redirect cargoes or withdraw from routes whose commercial returns no longer justify the risks.

Radev Confronts the Consequences of Moscow’s War

The attacks have also placed Bulgarian Prime Minister Rumen Radev in an increasingly difficult political position.

Radev has advocated renewed diplomatic engagement with Moscow and questioned the emphasis placed on military assistance to Ukraine. He has rejected accusations of being pro-Russian, presenting his approach as a pragmatic alternative to prolonged confrontation.

Yet the attacks have demonstrated the limitations of maintaining political distance from a war whose economic and security consequences are reaching Bulgarian waters.

After summoning Russian Ambassador Eleonora Mitrofanova on 13th October, Radev acknowledged that Bulgaria possessed no conclusive evidence establishing responsibility for the latest strikes. Nevertheless, he argued that their consequences benefited Russia and questioned why Ukraine would attack its own commercial vessels.

According to the Bulgarian News Agency’s account of the meeting, the prime minister also warned that higher insurance costs and shipping companies’ reluctance to serve Bulgarian ports were already damaging the national economy.

This is the fundamental change confronting Sofia. The conflict is no longer solely a question of Bulgaria’s position towards Ukraine or its diplomatic relationship with Russia. It is affecting the country’s commercial interests, energy supplies and responsibilities as a NATO member.

Radev’s response does not necessarily indicate a wholesale reversal of his previous political position. It demonstrates that the practical obligations of government can leave considerably less room for accommodation with Moscow than the arguments advanced from outside direct responsibility for national security.

Food Security Becomes Another Instrument of Pressure

The broader consequences may be felt most severely outside Europe.

Ukraine remains an important supplier of wheat, maize and vegetable oils to international markets, including countries in Africa, Asia and the Middle East. Interruptions to these exports affect more than Ukraine’s agricultural revenues. They can increase transport costs, delay deliveries and reduce the availability of competitively priced food in import-dependent countries.

Speaking at the Warsaw Security Forum on 12th October, President Volodymyr Zelenskyy warned of a possible agricultural crisis, arguing that Russian interference with Black Sea shipping could leave countries in Africa, Asia and the Middle East facing serious supply difficulties within months.

The warning reflects a mechanism already familiar from the earlier stages of Russia’s invasion. Following Moscow’s withdrawal from the UN-brokered grain agreement in July 2023, Ukrainian agricultural exporters faced renewed attacks on port infrastructure and substantial uncertainty over maritime access.

The danger is not necessarily an immediate worldwide shortage of grain. Wheat prices remained relatively steady following the 13th October incidents. Rather, sustained disruption could progressively reduce available export capacity, increase costs and place vulnerable importing countries under greater pressure.

For Moscow, such disruption could serve several purposes simultaneously: weakening Ukraine’s economy, raising the costs of international support for Kyiv and creating additional pressures on governments concerned about food inflation and social stability.

Europe’s Black Sea Security Strategy Faces a Practical Test

The immediate challenge for Brussels and NATO is how to protect commercial navigation without allowing the conflict to expand into a direct military confrontation.

Bulgaria has requested stronger air and maritime surveillance and is seeking closer coordination with Romania and Turkey. Defence Minister Dimitar Stoyanov said on 14th October that Sofia expected to join a NATO counter-drone initiative by the end of the month.

The EU has already developed a framework for addressing precisely such threats. Its Black Sea strategy, announced in May 2025, proposed a maritime security hub integrating surveillance, intelligence-sharing, infrastructure protection and regional cooperation.

The attacks now expose the difference between developing a security framework and providing effective protection to merchant vessels. Better intelligence can identify threats, but preventing further sinkings requires detection systems, coordinated responses and sufficient defensive capabilities.

Turkey’s involvement is particularly important because of its control over the Bosphorus and Dardanelles and its established role in Black Sea maritime security. Any workable regional arrangement must therefore extend beyond cooperation between Bulgaria and Romania.

The incidents occurred outside Bulgaria’s 12-nautical-mile territorial sea, meaning they do not automatically constitute an armed attack on NATO territory under Article 5. Nevertheless, repeated strikes within the economic zones of alliance members pose a substantial challenge to maritime security.

Russia’s campaign against Ukrainian exports is increasingly imposing costs on neighbouring European states and international trading partners. The question facing the EU is whether it can secure the commercial routes on which both Ukraine’s economy and the food supplies of millions beyond Europe depend.

Two merchant vessels have been attacked by aerial and maritime drones in Bulgaria’s exclusive economic zone in the Black Sea, sinking one ship and forcing the evacuation of another. The incident follows a deadly attack on a grain carrier off Romania a day earlier and has prompted concern over the growing risks to civilian shipping close to EU and NATO territory.

Two commercial vessels were struck by drones in Bulgaria’s exclusive economic zone early on Tuesday, 6 October, in the first known attack of its kind on merchant shipping in Bulgarian waters.

The Togo-flagged ALFA WATAN suffered severe structural damage and sank, while the Palau-flagged ABLE caught fire. Bulgarian Prime Minister Rumen Radev said the vessels were attacked at around 3am by both aerial and maritime drones about 70 nautical miles east of the coastal town of Byala. The Bulgarian government said a search-and-rescue operation was continuing for the crew of the ALFA WATAN, whose fate remained unknown.

All 18 people aboard the ABLE were rescued after abandoning the burning vessel. The Bulgarian-flagged passenger and freight ferry DIOSCURIA was diverted to the area and initially took the crew on board before Bulgarian Navy and Border Police vessels transferred them towards Varna.

The crew comprised 11 Turkish and seven Indian nationals. Two sailors were taken to hospital, including an Indian crew member suffering from burns and the Turkish captain, who sustained a head injury. Bulgarian public broadcaster BNT reported that the remaining 16 sailors subsequently arrived safely in Varna for medical checks.

The ABLE was reportedly carrying grain towards Istanbul. The cargo aboard the ALFA WATAN, which had been heading north towards Romania, has not been officially established.

Radev convened an emergency meeting involving the ministries of defence, interior, transport and environment, alongside the presidency and Bulgaria’s security services. He described the attack as an unacceptable violation of international and maritime law and warned of its effect on commercial navigation in the Black Sea.

Bulgarian authorities have not publicly identified who launched the drones. Investigations are examining both the weapons used and the circumstances surrounding the attack. One rescued Turkish sailor told Bulgarian television that he believed the ABLE had been hit by a Russian underwater drone, but that account has not been independently established and Sofia has made no formal attribution.

Foreign Minister Velislava Petrova said Bulgaria was in contact with its European and NATO partners and described Black Sea security as inseparable from wider European security. She said civilian crews and freedom of navigation must be protected and that Bulgaria would work with its allies to assess the wider consequences for maritime security.

European Commission President Ursula von der Leyen also condemned attacks against civilian shipping, saying the situation in the Black Sea was becoming increasingly concerning. She said commercial vessels and their crews were being targeted as investigations continued into the latest incidents.

Tuesday’s attack came less than 24 hours after another commercial vessel caught fire and sank in Romania’s exclusive economic zone. The Turkish-owned Royad Mammadov, sailing under the flag of Saint Kitts and Nevis, had left the Ukrainian Danube port of Izmail carrying corn for Ravenna in Italy.

Romanian authorities confirmed that two people died and 11 crew members were rescued. President Volodymyr Zelenskyy said the vessel had been struck by two Russian drones, although Romanian authorities did not themselves publicly attribute the incident to Russia.

The two incidents in consecutive days mark a further geographical expansion of the risks facing commercial shipping in the western Black Sea. EU Today has previously reported how strikes near Romania have moved maritime war risks closer to NATO territory, while a separate maritime drone explosion at Constanța raised questions over the ability of coastal states to detect and respond to unmanned systems approaching commercial infrastructure.

The distinction between territorial waters and an exclusive economic zone remains important. The attacks occurred outside Bulgaria’s territorial sea and therefore do not amount simply to an attack on Bulgarian territory. They nevertheless took place in an area where Bulgaria has internationally recognised economic rights and responsibilities, including search-and-rescue and environmental obligations.

The immediate concern for Sofia is the search for the missing crew of the ALFA WATAN and the possibility of pollution from the wreck. The wider concern for the EU is the increasingly exposed position of civilian shipping routes linking Ukraine, Romania, Bulgaria and Turkey.

Ukraine’s maritime export routes remain particularly important for agricultural trade. Repeated attacks on merchant vessels can increase insurance premiums, discourage shipowners from entering the region and raise transport costs even when ports themselves remain operational. Russian attacks on Odesa and its export infrastructure have already placed Ukraine’s Black Sea grain corridor under sustained pressure.

With merchant ships now struck in the economic zones of both Romania and Bulgaria on consecutive days, Black Sea maritime security has moved further onto the agenda of EU and NATO governments along the western coast.

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