Seven vessels were targeted over the last 10 days, as attacks shifted from exclusive economic zones into the 12NM territorial waters of NATO member states. Eleven sailors remain missing from the most recent sinking off Bulgaria, where a U.S. Navy submarine-hunting plane has also been patrolling. Sofia has formally requested fighter aircraft and counter-drone defenses to protect routes serving Danube ports, while a NATO military source told Reuters the drones were of Russian origin.
