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.