The Swedish navy said Tuesday it had recovered from the Baltic Sea the anchor of an oil tanker suspected of belonging to Russia's "shadow fleet" and damaging four underwater telecoms cables and one power cable on Dec.

Finnish police said on Tuesday they had recovered a lost anchor from the seabed as part of an investigation of suspected sabotage against power and internet cables in the Baltic Sea.

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.