I’m not convinced of that, there are some things that a president can’t just overcome, and NATO and American commitment to it and the United States military’s being intertwined with it, has a weight of it’s own, regardless of what a lame duck president in his last two years can do, even if he secretly supports Putin as you claim.
NATO, etal seem to be having very, very little effect on Putin’s revanchist nature to date. But time will tell.