That's what Putin was banking on us believing, after he had failed at Blitzkrieg. That threat held us at bay long enough for him to turn the invasion into a war of attrition, which he had a better chance of winning.
The outcome of a war of attrition depends on the resources each side can draw upon, which means the warring parties are entirely dependent on their friends. Trump withdrawing American assistance isn't a neutral act, it is positive support for Putin. Europe will suffer the consequences first - then it will rebound on America.
Quoting you from another post:
You predicted that very well: There is a meeting of European heads of state in Paris today to discuss security in Europe independently of NATO (i.e. a EUTO).