That was never his real aim. The whole trump stick was that he wanted to lessen the military expenditure of the us.
As the us historically and in the present always has taken the vast burden of maintaining the power of nato.
The 2% expenditure of gdp was agreed upon commonly back in 2006 but was never really followed through on by member states.
Trump wanted to make that mandatory (not just him tbh many of the less dovish nato members wanted to make that mandatory).
Like a pay your bills or else we let the wolves eat you.
It worked somewhat but not very well sadly. As no major threat presented itself clearly, it was hard for governments to defend the extra expenditure.
And worse yet it was a very lose threat, the option never presented itself as something realistic. (Strategically the loss of such vast/ important territories would always mean it was never going to be a genuine option).
Now the climate is somewhat different you could say lol, and we can thank Putin for that.
Shame that we needed something like this to wake up.
But understandable at the same time, we in europe have enjoyed the american peace for so long that people have come to believe it is something natural.