Pipeline transport • Natural gas • Russia • Nord Stream II • Gas

The damage did not have an immediate impact on Europe’s energy supplies. Russia cut off flows earlier this month, and European countries had scrambled to build up stockpiles and secure alternative energy sources before that.

But the episode is likely to mark a final end to the Nord Stream pipeline projects, a more-than-two-decade effort that deepened Europe’s dependence on Russian natural gas — and that many officials now say was a grave strategic mistake.

The pair of explosions Monday produced leaks in all three of the underwater Nord Stream pipelines that connect Russia and Germany, causing massive plumes of gas bubbles to break the surface of the Baltic Sea.

“These are deliberate actions, not an accident,” Danish Prime Minister Mette Frederiksen told reporters Tuesday. “The situation is as serious as it gets.”