I never said this in unwinnable, but don't make any sense to propose a peace plan to Russia right now demanding them to return all the land they occupied. Ukrainians are not dumb, they know this, this peace "proposal" is just a piece of propaganda to western media to say they are trying to start peace talks with Russia or some shit. The Russian ministry answered this out of anger but he's not wrong, the Ukraine is only getting their territory back if they can put a huge pressure on Russians, possibly only if they can manage to make Russia fear to be attacked on their own territory. And even if this happens we have to trust Russians won't nuke Ukraine to protect their own territory.