Last June, the Navy divers, operating under the cover of a widely publicized mid-summer NATO exercise known as BALTOPS 22, planted the remotely triggered explosives that, three months later, destroyed three of the four Nord Stream pipelines, according to a source with direct knowledge of the operational planning.

Two of the pipelines, which were known collectively as Nord Stream 1, had been providing Germany and much of Western Europe with cheap Russian natural gas for more than a decade. A second pair of pipelines, called Nord Stream 2, had been built but were not yet operational. Now, with Russian troops massing on the Ukrainian border and the bloodiest war in Europe since 1945 looming, President Joseph Biden saw the pipelines as a vehicle for Vladimir Putin to weaponize natural gas for his political and territorial ambitions.