Bulgaria summons Russian ambassador after Black Sea drone attack sinks cargo ship

Bulgarian leader Rumen Radev summoned Russian envoy Eleonora Mitrofanova after two commercial ships were hit by drones off Bulgaria's Black Sea coast on Tuesday and one of them sank.

The Guinea-Bissau-flagged HS Dignity went down 17 nautical miles east of the village of Krapets after sending a distress signal. Defence Minister Dimitar Stoyanov said six crew members were rescued and ten others are missing. A second ship, the Ukrainian-owned Chelsea-3, was struck 18 nautical miles from the town of Byala; all 15 crew members were rescued.

The attacks came a week after two other commercial vessels were hit by sea and aerial drones in Bulgaria's exclusive economic zone. One of those ships, the Alfa Watan, sank and all ten crew, including nine Syrians, are presumed dead.

Radev convened an emergency meeting and said he had summoned Mitrofanova. He acknowledged there was no conclusive evidence of blame on "either side", but said "the logic suggests that the outcome benefits the Russian Federation".

Mitrofanova was quoted by Bulgarian media as telling Radev she had no information from Russia's defence ministry relating to the latest attacks. She also suggested the strikes could have been a provocation by a third party.

Bulgaria is a Nato member state, and the incidents place military confrontation in the Black Sea in close proximity to the alliance's territory. Neither Bulgaria nor Russia has yet presented concrete evidence assigning responsibility for the strikes.

Analysis

Why This Matters

The attacks bring Black Sea hostilities to the doorstep of a Nato member, raising the risk of direct escalation between Russia and the alliance.
Civilian shipping in the region, including routes used for grain exports, faces growing danger as drone warfare spreads beyond the conflict zone.
Ten sailors remain missing and the families of those lost on the earlier Alfa Watan are still waiting for answers.

Background

Russia's invasion of Ukraine has turned the Black Sea into a contested maritime zone, with both sides using missiles and drones against naval and commercial targets. Bulgaria, a Nato member with a long Black Sea coastline, has largely stayed out of direct involvement but has repeatedly faced spillover from the war, including stray debris and now apparent drone strikes near its waters. The latest incidents follow an earlier wave of attacks on commercial shipping in Bulgaria's exclusive economic zone.

Key Perspectives

Bulgarian government: Radev says there is no conclusive evidence assigning blame, but that the logic of the situation points to benefits for Russia, and he has formally summoned the Russian ambassador over the incidents. Russia: Ambassador Mitrofanova says Moscow's defence ministry has no information on the latest attacks and suggests a third party could have staged the strikes as a provocation. Critics and sceptics: The pattern of repeated strikes on merchant vessels in a Nato member's economic zone will raise questions about whether enough is being done to protect commercial shipping and whether the attacks are being treated with sufficient seriousness.

What to Watch

Whether Russia provides any evidence or official response to Bulgaria's diplomatic protest.
Any Nato move to increase maritime surveillance or escort commercial traffic in the western Black Sea.
The search for the ten missing crew members from the HS Dignity and any confirmation of their fate.

Analysis

Why This Matters

Background

Key Perspectives

What to Watch

Sources