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.

Finland on Thursday seized a ship carrying Russian oil on suspicion the vessel had caused an outage of the Estlink 2 undersea power cable linking it with Estonia and fiber optic lines, and on Friday said it had asked NATO for support.

Baltic Sea nations are on high alert for acts of sabotage after a string of outages of p

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