I find this timeline interesting:
Wednesday Trump had a 90 minute phone call with Putin. The call happened prior to Trump mentioning it to the press at a 14:00 press event.
Then at 17:48 Trump posts on Truth social that he is now studying the possible reduction of US troops in Germany.
Correlation is not causation, and Trump has talked about pulling away from Europe before. But it is worrying that Trump is talking to the enemy, and immediately thereafter wants to weaken our defences.