Sounds like a decent deal for Ukraine honestly, most of the Russian-speaking Ukrainians from those 4 oblasts mentioned hate the Ukrainian government anyway. Plus keeping the war going with NATO will only lead to all of Ukraine being gutted out and destroyed over time, with tens of millions dead and a huge shortage of population for Ukraine to ever recover in the future (if not inevitably absorbed by Russia). Not only that, it would de-escalate the massive societal and political unrest risks of another world war in the West. No one I personally know would ever fight for the crooked government we have today. It's just not going to happen, and even the recent European Parliament elections sent that very strong message of disapproval. So honestly Ukraine has everything to lose if they refuse to take that deal up. Sucks for them if they don't.