The Ukraine war’s spillover into the Black Sea is creating a growing European security and commercial risk: Drones are hitting ships and killing sailors, grain routes are under strain, and insurers and investors are weighing the cost of operating through Ukraine’s ports.

Axar.az reports, citing Politico, that five commercial vessels have been hit in Bulgarian and Romanian waters over the past week alone, leaving at least four people dead, several sailors missing and others injured. In response, Black Sea countries Bulgaria, Romania and Turkiye have raised the issue at NATO, asking for more focus toward the region and joint support, according to two alliance diplomats.

“The attack within Bulgaria’s exclusive economic zone is absolutely unacceptable. It constitutes a serious breach of maritime and international law and will further jeopardise safe navigation in the Black Sea,” Bulgarian Prime Minister Rumen Radev said on X after the attacks last week.

Russia has been attacking Ukrainian ports and cities in the area since the start of its full-scale invasion. But the recent strikes have brought the spillover into NATO territory. If they continue, EU leaders will face pressure to protect Black Sea shipping and keep Ukrainian trade moving.

Those questions will be top of mind at Thursday’s European Council summit. According to draft conclusions obtained by Politico, leaders are expected to discuss the “immediate restoration of safe passage for grain cargo ships.”