He wouldn't have done that, he was actually strengthening NATO by asking our allies to pay up and adhere to their commitments, to actually be serious about it.

Also, the reason why Russia invaded is NATO at their doorstep, Trump would have talked to Zelensky and probably brokered a peace deal between Ukraine and Russia, similar to what he did many times:

https://www.dailywire.com/news/breaking-trump-secures-another-peace-deal-between-israel-and-an-arab-nation

Trump is a deal-maker and a peace-maker.