Sweden has sent a formal request to China to cooperate with an investigation into suspected sabotage over the sudden disruption of two submarine internet cables in the Baltic Sea earlier this month, after tracking data linked a Chinese ship to the incidents.

Another cable at the bottom of the Baltic, between Sweden and Lithuania, was broken a day before Cinia's cable was damaged. It was repaired on Thursday evening, according to Arelion, the Swedish firm that manages the cable. That cable is now operating at full capacity, Arelion told news service STT.

Sweden has formally asked China to co-operate with an investigation into damage to two cables in the Baltic Sea last month. The cables - one linking Sweden to Lithuania and the other between Finland and Germany - were damaged in Swedish territorial waters in the Baltic Sea on 17 and 18 November.