Wasn't it the point of Nord Stream sabotage? https://brian-whit.medium.com/nord-stream-sabotage-a-look-at...
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The US were not thrilled about it when it was being constructed, obviously, but this was normal tensions towards Russia, prescient in the end but here we are.
My money is actually on Polish special forces (or one of the Baltic states), in an effort to force Germany to be serious about weaning itself off Russian natural gas.