Bulgaria Seeks NATO and EU Support After Drone Strikes Sink Merchant Ship in Black Sea

The maritime spillover of the Russia-Ukraine war has reached the immediate maritime borders of the European Union, with two commercial vessels struck by aerial drones early Tuesday morning. The attacks occurred within Bulgaria's exclusive economic zone, leaving one ship sunk and multiple seafarers missing in the Black Sea.[3][5]

The strikes represent the second time in seven days that civilian shipping has been targeted off the Bulgarian coast. The frequency of the attacks has effectively turned the western Black Sea into an active military zone, threatening the primary export routes for Ukrainian grain and regional trade.[3][4]

Bulgarian Prime Minister Rumen Radev confirmed the strikes during an extraordinary security council meeting in Sofia. He stated that the vessels were hit just outside the nation's territorial seas, describing the repeated targeting of merchant ships in the area as a gross violation of international law.[3][4]

"Another attack on merchant ships in the immediate vicinity of Bulgarian territorial waters is absolutely unacceptable," Radev said in a public statement. The prime minister emphasized that the strikes directly threaten the safety of supply chains and the lives of civilian mariners operating in the region.[4]

The Chelsea 3 and a Sunken Vessel

The first distress call came at approximately 1:30 a.m. local time from the Chelsea 3, a Ukrainian-owned coastal freighter sailing under a Maltese flag. The vessel was positioned roughly 18 nautical miles east of the Bulgarian coastal town of Byala when it was struck by three aerial drones.[3][5]

Bulgarian rescue teams successfully evacuated all 15 crew members from the damaged freighter. The crew, consisting of seven Ukrainian and eight Azerbaijani nationals, was transported to the port of Varna, where five seafarers received medical treatment for injuries sustained during the strike.[3][5]

Shortly after the Chelsea 3 was hit, authorities received reports of a second drone strike targeting an unnamed merchant ship about 17 nautical miles east of Krapets. That vessel suffered catastrophic structural damage and sank rapidly into the Black Sea following the impact.[3][5]

Rescue operations for the second ship have yielded minimal results amid challenging maritime conditions. As of Tuesday morning, only one crew member had been pulled from the water, leaving the remainder of the crew unaccounted for and presumed lost at sea.[4][5]

Sofia Appeals to NATO

In response to the escalating threat, the Bulgarian government has formally requested assistance from both NATO and the European Union. Sofia is seeking allied support to conduct a joint investigation into the origin of the drones and to establish clear attribution for the strikes.[1][2]

Beyond investigative support, Radev has asked the military alliance to help strengthen Bulgaria's air and maritime surveillance capabilities. The government aims to deploy enhanced radar and monitoring systems to detect low-flying unmanned aerial vehicles before they reach commercial shipping lanes.[2][3]

Radev has already briefed NATO Secretary General Mark Rutte on the situation and notified Bulgaria's permanent representatives in Brussels. The diplomatic push reflects Sofia's limited unilateral capacity to secure its expansive exclusive economic zone against sustained hybrid warfare tactics.[2][3]

While Bulgarian officials have stopped short of formally blaming Moscow, the strategic incentives point clearly in one direction. Radev noted that the government lacks conclusive evidence to attribute responsibility, but acknowledged that logic suggests the outcome benefits the Russian Federation.[5]

A Pattern of Escalation

The Tuesday strikes follow a nearly identical incident from October 6, when unidentified drones attacked two other merchant ships in the same maritime corridor. That earlier assault sank one merchant vessel and set a second ship on fire, prompting an initial wave of security concerns.[3][5]

The October 6 attacks occurred roughly 70 nautical miles east of Byala, further out to sea than the most recent strikes. The inward progression of the drone activity indicates that the operational radius of the attacks is creeping steadily closer to the Bulgarian shoreline.[3][5]

The loss of life in these incidents has been severe, marking a deadly turn for civilian shipping. The sinking of the merchant vessel last week left 11 crew members lost at sea, and the latest sinking threatens to add significantly to the civilian death toll.[4][5]

The Bulgarian government has summoned the Russian ambassador to Sofia for a formal meeting to address the crisis. The diplomatic summons underscores the growing friction between the NATO member state and Moscow over the security of the shared maritime domain.[5]

International Condemnation

The attacks have drawn sharp rebukes from European leadership in Brussels. European Commission President Ursula von der Leyen strongly condemned the strikes, warning that the Black Sea has become another front of escalation that threatens the lives of innocent crews.[2][4]

Ukrainian officials have been more direct in their attribution of the attacks. Foreign Minister Andrii Sybiha accused Russia of deliberately targeting civilian vessels to weaponize global food security, urging international partners to increase pressure on Moscow to halt the maritime campaign.[4]

The strategic objective behind the strikes appears to be the disruption of Ukraine's maritime export corridor. By raising the physical risks and insurance premiums for commercial operators, the attacks threaten to sever a vital economic lifeline for Kyiv's agricultural sector.[4][5]

For NATO, the incidents present a complex deterrence challenge on its eastern flank. The alliance must now decide whether to deploy naval assets to protect civilian shipping in the exclusive economic zones of its member states, or risk allowing the Black Sea to become a closed military theater.[1][2]

The Insurance Impact

The repeated strikes are already sending shockwaves through the maritime insurance markets. Underwriters are reassessing the risk premiums for vessels operating anywhere in the western Black Sea, a move that could price smaller shipping companies out of the regional trade entirely.[5]

If commercial operators refuse to transit the corridor, the economic fallout will extend far beyond Ukraine and Bulgaria. The disruption of these shipping lanes threatens to constrain global grain supplies, potentially triggering price spikes in international food markets just as the winter export season begins.[1][5]