I do think there is some motivation for the US or another western state having done it: The situation in Europe is far from stable and it might be possible that

I do think there is some motivation for the US or another western state having done it: The situation in Europe is far from stable and it might be possible that our strategies for the winter are not sufficient and we'll experience shortages or outages. In that situation, politicians may come under extreme pressure to reopen the pipelines. This might have been an preventive "intervention" to make such a "relapse" impossible. Of course it might just as well have been a russian false flag with exactly the aim of strengthening the "the US is secretly controlling Europe" narrative.