Trump is in talks with Russia to end the war

[Oldcarpy2]

Ukraine does not have an unending supply.
Russia does.  Their own because they are much bigger, and other countries fighters.
This is why 'peacekeepers' in Ukraine would be armed and would end up carrying the weight
if an invasion came again or this one was to spread.

Yes, but if the UK and others are willing to perform that role, what's your problem with that?

I think you are forgetting that if the European and UK boots on the ground are attacked their overwhelming air superiority would come into play so your scenario seems unlikely.