Amount are much lower, on ukraininan side.
Hard to find an agreeement if russia wanna keep crimea. Russia should just retreat as they started the war.
Ukrain can't just let crimea and other annexed teritories go to russia cuz it would let the door open to other attacks, like why not reattacking ukrain if they let it slide.
Unless russia accept to retire the chance of agreement is low, russia won't agree to retire before to use all of its manpower because all the propaganda used in russia to market it as an easy war would mean puttin lied, and is in a position of weakness and russia can't let that hapleb to keep people support.