Der Spiegel reports that the CIA warned Berlin already in June. They would not have done so if the warning was of an American attack...
Again, catfish, Putin does not care for economy and needs of Russian people (he just has started to annihilate the Russian economy's workforce pool for the coming thirty years, if you have no noticed it). He now is "all in". He needs a destabilisation in Germany, and Europe. Therefore: no more gas sales. If the European poltical unity cannot be shaken by him, he is toast. No more gas sales. Not now. Not in the future. He is beyond that. Think of it as a point of no return.
Also, psychopath's logic.
"The subject is disobedient. It needs to be punished." The harder, the better. Deep rooting narcissism, and offence/insult (Kränkung). Any psychiatrist and psychologist must get bright eyes when readig his case. The KGB did not promote him beyond a certain rank becaise its analysts assessed him to be incapable to fully forsee the consequences of his decisions and acting in the present. From that prspective it is surprising that he was able to play the Europeans against the wall for almost 20 years. The explanation for that however is less to be found in him, and more in the weaknesses of the Europeans.