The Baltic Sea has seen multiple attacks on energy and communications infrastructure since Russia’s invasion of Ukraine in February 2022. These have often been linked to hybrid warfare tactics

General Mark Rutte says the military alliance will step up patrols in the Baltic Sea area as Finnish investigators work to establish whether a ship linked to Russia sabotaged undersea cables there this week.

Finnish police said on Sunday they had found tracks that drag on for dozens of kilometres along the bottom of the Baltic Sea where a tanker carrying Russian oil is suspected of breaking a power line and four telecoms cables with its anchor.

Finland says a ship affiliated with Russia's "shadow fleet" is linked to a 60-mile-long anchor drag mark on the seafloor. A power cable in the Baltic Sea was severed last week.

Police and media reports say that Finnish authorities have detained a Russia-linked ship as they investigate whether it damaged a Baltic Sea power cable and several data cables.

This photo provided by Rajavartiosto (Finnish Border Guard) on Thursday, 26 Dec 2024, shows the oil tanker Eagle S, background, and the Finnish Border Guard ship Turva.