assumed that providing Kiev with the required ammunition and training would lead to victory

I actually do not believe this for a second. My understanding is that the actual higher ups wanted to engage Russia in a war regardless of the outcome plus the ammunition/training part is just the military industry enriching itself. If anything, I think they were actually overly optimistic about Russia turning into a sort of an international pariah and the effectiveness of the sanctions imposed on them, both of which did not pan out at all.

I'm not entirely sure howmany of the politicians in america actually believe their propaganda about ukrainian heroes and democracy and stuff and howmany are neocons wishing to deal a blow against russia