Zelensky Blames Russia for Drone Attacks on Bulgarian Ships as NATO Escalation Concerns Mount

Two civilian vessels were struck by drones in Bulgaria's Black Sea economic zone, with Ukrainian President Zelensky attributing the attacks to Russian maritime and aerial drones based on contacts with Bulgaria's navy. Bulgarian Prime Minister Rumen Radev took a more cautious stance, stating the drone origin remained unclear and ruling out NATO Article 4 and 5 invocations. Zelensky characterized the incidents as part of Russia's broader campaign to make the western Black Sea unsuitable for navigation.

The overnight incident targeted two merchant vessels operating within Bulgaria's maritime boundaries in the Black Sea. One ship sustained damage while traveling southbound with a wheat cargo, while a second vessel moving northward ultimately sank, with authorities lacking immediate information about its cargo at the time of the attack. Both vessels were struck by coordinated drone strikes involving both surface-launched and airborne systems.

Bulgarian leadership's refusal to invoke NATO collective defense protocols reflects uncertainty about attribution and suggests Sofia's assessment that the incident, while serious, does not meet the threshold for alliance-wide military response. This measured response contrasts with Zelensky's more direct attribution, highlighting the diplomatic complexities surrounding Black Sea security incidents where multiple parties operate armed capabilities in contested waters.