Russia started the war by invading Ukraine. Russia can end the war any time they want by simply moving all of their troops out of Ukraine and back behind their border.

Any concession to Russia means we are saying that it's ok for nuclear-armed states to invade their neighbours at will, and to expand their territory at will, because "oh no, ww3!".

That is unacceptable. That is unjust. There is exactly one guilty party in this conflict, and it is not Ukraine. We do not appease dictators who invade their neighbours.