Trump was at least as much of a factor in setting the stage for Russia's invasion of Ukraine and the ensuing humanitarian catastrophy as any other US president since Bush sr., and was in fact worse than most in this regard.
Um... yes, this is exactly my point. Trump helped set the stage for the invasion in all the ways you describe (leaving treaties which enabled Russia to ramp up - at least threats if not actual working nuclear weapons), calling for a NATO exit, withholding aid from Ukraine. I don't follow your logic here, are you happy that the war started?
Edit: I think I might get it now. Trump and other US presidents are responsible for the war, but not Putin. Is that correct?
https://lemmygrad.ml/comment/1696287