By thanking the United States in this way, Sikorski is as if he were clearly attributing the authorship of the act of sabotage. It does not end here.

I didn't have much of a positive opinion of Sikorski, but then I found this comment on MoA. Looks like his opinion about Poland is quite close to mine:

As for Russia as perpetrator, the question is whether Germany will get out of the take-or-pay contract with Russia. Right now, Germany has to pay 10 billion USD annually to Russia until 2030 irrespective of taking any natural gas or not. It's the reason why the price per m³ is so cheap for Germany.

If they get out from this contract, because the delivery can't happen anymore (not even theoretically), then it would be a disqualifier to me for Russia to be the perpetrator. A total of 80 billion USD is simply too much to risk for something you don't have certainty about, especially, since Russia has also contracts with at least Switzerland and Austria, while each of the two pipelines cost close to 10 billion USD to built.

No false flag in the world is viable for the cost of more than 100 billion USD in guaranteed income. Right now on my list on the top is Poland with help of the US, or the US with silent agreement of Poland. They are both very eager to escalate the war while damaging Germany & Europe in the process economically as much as possible. Third place goes to China, because they would win most in the mid-term from an escalation, while having few to little risks involved.