The Black Sea has surpassed the Strait of Hormuz to become the world’s deadliest maritime trade route, with more than 30 seafarers killed in over 300 attacks this year.
Escalating Drone Warfare
Maritime security company Ambrey recorded more than 300 attacks in the Black Sea this year, according to figures cited by Hindustan Times. Those incidents have killed more than 30 seafarers and left more than 20 others missing, based on records from the Turkish Shipowners’ Association, MarineTraffic, and local authorities.
In contrast, since the U.S.-Iran conflict started at February’s close, the International Maritime Organization has logged roughly 130 strikes and 25 fatalities spanning the Strait of Hormuz and the broader Middle East region.
The violence has expanded from initial naval engagements near Ukraine to the exclusive economic zones of NATO members Romania and Bulgaria. According to Geopolitical Monitor, three naval drones targeted and subsequently sank the container ship Contship Jet on October 28 within Bulgaria’s exclusive economic zone while it was journeying toward Constanța.
Bulgarian Prime Minister Rumen Radev summoned Russian Ambassador Eleonora Mitrofanova following strikes near his country’s waters, stating that the circumstances pointed to Russia, as reported by The Moscow Times. Moscow has denied involvement in the attacks.
The 2026 escalation began as a Ukrainian campaign directed against the shipping routes supplying occupied Crimea and carrying Russian exports, before widening when Russia answered with its own strikes. Georgian, Bulgarian, Romanian, Russian, Turkish, and Ukrainian shores border the sea, giving it access to vital international trade routes. Following the full-scale Russian invasion in February 2022, the Black Sea Fleet blockaded Ukrainian ports, restricting grain transport exclusively to the Black Sea Grain Initiative—an agreement mediated by the UN and Turkey that ran from July 2022 until Russia pulled out in July 2023.
Turkish President Recep Tayyip Erdoğan discussed the Black Sea with Ukrainian counterpart Volodymyr Zelenskyy in Istanbul on October 31, informing reporters of his intent to schedule talks with Vladimir Putin soon. Turkish, Bulgarian, and Romanian defense ministers met in Sofia on October 28 to review approaches to the crisis.
“We are determined to use the powers the Montreux Convention grants our country to ease the crisis,” Turkish President Tayyip Erdoğan said.
War-Risk Insurance Premiums Rise Above Historical Peaks
War-risk insurance premiums for high-risk Black Sea voyages have surged as high as 20% of a vessel’s value, according to Beinsure. Those rates exceed historical peaks from the 1980s Tanker War, where premiums reached 7.5% and occasionally topped 10%.
For a mid-sized vessel insured at $50 million, a 20% premium adds $10 million in additional costs for a single exposure, Insurance Business noted. Major shipping lines have begun passing those expenses to customers. CMA CGM implemented a war-risk surcharge of $35 per twenty-foot equivalent unit on shipments serving Black Sea ports including Constanța, Varna, Burgas, and Poti, while import cargo incurs a surcharge of USD55 per TEU.
Broader insurance costs for certain voyages climbed to approximately 10% to 20% of vessel value, contrasting with 0.25% to 0.35% before the February 2022 full-scale invasion.
Trade Traffic Collapse
The mounting security risks have choked commercial transit through the basin. Cargo traffic across the Black Sea dropped 37% year-on-year in October, with the number of operating cargo vessels falling to 1,370 from 2,091 in March, according to data cited by CMB News. Global Fishing Watch data shows that ship entries through the Bosporus fell 41% in October compared with the same month in 2025.
“So it's really happened, it's closed… It's closed to all maritime traffic, not only to Russian ships,” Yoruk Isik, an Istanbul-based geopolitical analyst and head of the Bosphorus Observer consultancy, told Reuters.
Agricultural exports have absorbed a heavy blow. The Food and Agriculture Organization attributed a 6.3% rise in world wheat prices in September partly to logistical constraints in the region.
The number of cargo vessels operating in the Black Sea declined 37% year-on-year in October 2026, resting roughly 34.5% below March levels. Ship transits in both directions dropped 38% in October compared to the previous year.
Response Along NATO’s Flank
NATO allies are deploying additional resources to secure the eastern border. On Monday, the European Commission announced plans to fast-track a Black Sea maritime-security hub, as reported by Hindustan Times.
Romania and Bulgaria, alongside Turkey, activated their joint Black Sea mine-countermeasures group over the weekend, participating in naval exercises off Bulgaria while Spanish F-18 fighters scrambled from Mihail Kogălniceanu airbase after radar detected aerial targets near Snake Island, Splash247 reported.