I think you sort of made my point for me.You know this how?
Did you also predict the collapse of the USSR in 1991?
In reality, all it would take is a few key weapons systems and Ukraine would turn the tide and begin repelling Russia. Do you not think we possess the technology and arms to defeat Russian troops currently in Ukraine? Of course we have it. We've chosen not to put boots on the ground (agree with that), but we've also chosen to not give Ukraine the weapons necessary to win outright. Beyond my pay grade, but the rationale is probably along the lines of Putin is the devil we know. If he loses in Ukraine, he'd like fall out a window in short order, and then we have a federation of states there - possessing nuclear arms - that could fall into political disarray and civil unrest.
Zelenskyy has his work cut out for him.