Drone Attacks on Merchant Ships in the Black Sea Raise Alarms Across Europe and NATO

A series of drone attacks on merchant ships in the Black Sea, occurring near the coasts of NATO members Bulgaria and Romania, have prompted NATO to consider deploying anti-drone defenses in the region. Nearly two dozen sailors have been killed or reported missing. European and NATO officials are responding to what analysts describe as hybrid warfare tactics, as the Black Sea remains a vital corridor for global grain exports.

Naval activity tied to the conflict in Ukraine has pushed into the Black Sea over a span of roughly two weeks. Unmanned aerial projectiles targeted several cargo ships — vessels carrying grain and other civilian freight — in Black Sea waters bordering Bulgaria and Romania, both members of the NATO alliance, with available evidence pointing toward Russian involvement in the attacks.

Around 20 naval personnel from several countries were listed as dead or missing. Boryslav Bereza, a Ukrainian blogger, wrote on Facebook that he believed Moscow was watching for a reaction from the EU and NATO before settling on its next move.

These incidents point to a pattern in which activities such as disinformation operations, drone deployments, cyberattacks, and infrastructure sabotage — none of which constitute open armed conflict — have been documented across European territory, including in the Baltic region and the Arctic. Concerns raised across Bulgaria and Romania prompted a coordinated response from officials at the European level.

Discussions within NATO are now focused on the possibility of repositioning anti-drone systems toward the Black Sea, a body of water that connects European territory with both Central Asia and the Mediterranean basin.

Three developments have shaped the alliance's posture in the region: Bulgaria lodged formal objections over the vessel attacks with Russia's ambassador in Sofia, a step taken even as its prime minister's stance toward Moscow has attracted outside attention; NATO Secretary-General Mark Rutte, speaking Thursday, indicated the alliance would continue coordinating with its Black Sea partners and refining its deterrence and defence arrangements as conditions evolve; and the EU put in place, during the preceding year, a framework intended to preserve open access to the Black Sea for civilian shipping and data infrastructure, rather than allowing that sphere to drift toward Russian dominance.

Diplomatic ties between Turkey, Romania, and Bulgaria have been strengthened in an effort to improve stability across the waterway Turkey administers — the Bosporus. Keeping commercial shipping lanes through the Black Sea open without triggering a wider armed confrontation has become a pressing challenge for European policymakers.

Prior to the conflict in Ukraine taking hold roughly four and a half years ago, the Black Sea served as a conduit for around a fifth of global wheat trade and close to a sixth of maize trade worldwide. Uninterrupted movement of those goods is widely regarded as necessary both for global stability and for the broader European ambition of building a region defined by peace and shared prosperity.