NATO is launching a new mission to protect undersea cables in the Baltic Sea region after a string of incidents that have heightened concerns about possible Russian activities, the alliance’s leader said.

The Baltic Sea operation in the region bordering Russia comes as European fears of sabotage mount after a string of disruptions to underwater cables.

NATO announced a new mission on Tuesday to better protect critical underwater infrastructure in the Baltic Sea with significantly more ships, aircraft and drones, as concerns about Russian aggression in the region grow.