Tell ya what, rent hasn't been cheap. How about I come to your house and set a few things on fire and camp out in your living room and refuse to leave. I won't hurt you if you don't enter the living room, but I've claimed the whole room to myself. And you have no way of knowing if I'll decide to take the kitchen next despite saying I won't. Would you accept this? Because this is what you're saying Ukraine should let Russia do to them.

The only peace that can be achieved here is for Russia to be defeated and driven out of Ukraine entirely. Otherwise, all you are doing is enabling Russia to regroup, rearm and attack again for more territory.