Finland has brought formal charges against the captain and two senior crew members of a Russian-linked oil tanker, and officials are describing it as NATO’s first criminal case over Baltic Sea sabotage.

The captain and two senior officers of the Eagle S tanker face charges of aggravated sabotage and aggravated interference with telecommunications.

Finland has filed charges against members of the Eagle S oil tanker, which is suspected of damaging five undersea cables by dragging its anchor between Finland and Estonia. The incident happened in December in the Gulf of Finland, when several cables were cut between the two countries.