I cannot imagine how things would play out if Trump went through with the invasion. Things are getting increasingly grim here in the states locally and a combination of martial law + a clearly illegal invasion I think would lead to the immediate collapse of the US as well as NATO.
It's clear that Stephen Miller in all of his fascist eggheaded brain thinks that he can just do a real quick annexation and is one of the key people pushing for this. But I don't think any of them are prepared for the fallout.