Here is the WSJ report

NATO said that a series of leaks on the Nord Stream pipelines between Russia and Europe were the result of sabotage and that attacks on its members’ infrastructure would be met with a collective response from the military alliance.

The statement, from the North Atlantic Council, the decision-making body of the North Atlantic Treaty Organization, didn’t provide details or evidence. It also noted that the damage to the pipelines occurred in international waters. But it marks the first time the alliance has formally warned that it would deter and defend against attacks on its members’ critical infrastructure following the now four documented leaks in the Nord Stream and Nord Stream 2 pipelines.

NATO Secretary-General Jens Stoltenberg separately wrote on Twitter that the sabotage on the pipelines was of “deep concern.”