The cutting of two undersea cables prompted warnings of "sabotage" and potential "hybrid" warfare in the West amid the ongoing war in Ukraine.

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.

Multiple countries are investigating and the authorities in Europe say they have not ruled out sabotage. But U.S. intelligence officials have assessed that the cables were not cut deliberately.