The Palau-flagged Larisa 1 vessel was hit by a kamikaze drone while sailing along Romanian waters towards Ukrainian ports on the Danube.
Following the blockade of its Black Sea ports, Ukraine diverted its exports through the river ports of Izmail and Rny in the Odesa region; Vessels arriving at these ports travel under the protection of NATO territorial waters.
As it turns out, there is no defense in this. Nor the intensive reconnaissance activity conducted by Western air forces in the region.