Ukrainian Maritime Drone Explodes at Romanian Black Sea Port, Raising Spillover Concerns

Jun 5, 2026

A Ukrainian maritime drone exploded in Romania's Black Sea port of Constanta after being disabled by Russian electronic warfare, with three other drones detonating offshore. While no one was injured, the incident prompted the evacuation of 1,300 people and heightened fears of the Ukraine war spilling into NATO territory. EU leaders condemned the event as a direct consequence of Russia's aggression, part of a pattern of recent incursions into Romania.

Constanta port drone explosions

▪Three other Ukrainian sea drones also self-detonated: two offshore from Constanta and one just outside the port.
▪The Ukrainian government confirmed to Romania that it had lost operational control of four drones in total.
▪A Ukrainian maritime drone self-detonated in the port of Constanta, Romania, on June 5, 2026, at approximately 10:30 a.m.
▪The explosion in the port occurred near an oil terminal, and no injuries were reported.

Russian electronic warfare jamming

▪The Russian Embassy in Bucharest denied responsibility for the incident, accusing Ukraine of using the drones for "terrorist acts."
▪The Ukrainian navy stated one of its unmanned vessels "came under the influence of the enemy’s electronic warfare systems" and lost control.
▪Ukrainian forces lost control of the drones as a result of Russian electronic warfare, which Romanian President Nicusor Dan identified as likely jamming.

Romanian beach evacuations

▪Helicopters were deployed to search for additional drones, and residents along the coast received text message alerts to take cover.
▪The evacuation measures were suspended by emergency authorities just before 3 p.m. on June 5, 2026.
▪Following the explosion, Romanian authorities evacuated more than 1,300 people from several Black Sea beaches.

NATO airspace violations pattern

▪In the same week as the Constanta explosion, Romanian forces destroyed another maritime drone and detonated a Russian anti-landing mine.
▪A month ago, Greece filed a formal complaint after a Ukrainian-built military sea drone with explosives was found off a Greek island.
▪A week prior, a Russian aerial drone struck an apartment building in Galati, Romania, injuring two people.
▪The incident is one of several recent security events in Romania, a NATO member state that shares a 650km (400-mile) border with Ukraine.

EU solidarity with Romania

▪European Commission President Ursula von der Leyen said Europe is investing heavily in anti-drone capabilities, air defense, and early warning systems.
▪Romanian President Nicusor Dan stated the drone's incursion into "Romanian sovereign space is a direct consequence of the war waged by Russia."
▪EU leaders, including European Council President António Costa and Commission President Ursula von der Leyen, called the incident a "direct consequence" of Russia's war.