Phillips O'Brien? He claims on Twitter Russia is the most likely candidate for blowing up the Nordstream pipeline. He's just a "Security services stenographer".
Who caused that is still an open question that no-one really has the answer to, so I'm not sure why you're so confident. One of the things that makes me trust O'Brien over others is that he generally admits when he's been wrong and openly reviews his past views in light of new evidence.