Nato has said it will enhance its military presence in the Baltic Sea, and Estonia has sent a patrol ship to protect its Estlink1 undersea power cable, after Russia was accused of sabotaging its main power link in the Gulf of Finland.

NATO said on Friday it would boost its presence in the Baltic Sea after the suspected sabotage this week of an undersea power cable and four internet lines, while alliance member Estonia launched a naval operation to guard a parallel electricity link.

Baltic Sea nations are on high alert for acts of sabotage following a string of outages of power cables, telecom links and gas pipelines since Russia invaded Ukraine in 2022, although subsea equipment is also subject to technical malfunction and accidents.