I can't see many Ukrainians fancying going back to half a country with an ever growing threat built up in what was formerly Ukraine only a stones throw from their new start. Also, the grain basket of the world, how will that be divvied up and firstly de-mined and then brought under the plough again? Who get's the ports for exports for instance.
There's bodies, and kidnaps, and rape and pillage to be faced, this won't be small white picket fences and perfectly manicured front lawns.
If there is a DMZ and a new soviet wall, can it be manned and protected and then the new 'west Ukraine' be run with western affluence to corrode the 'left Ukraine' from within? Do sanctions stay on russia forever? where's those gas pipes going? And when sold out soldiers and similar form their 'Ukrainian Peoples Army' to engage in guerilla tactics against russians and russian assets?
Establishing a state and policing it and paying for it seems a very tall order at the moment. Maybe belarus could be severely punished to up the ante somewhat. Surely all drug companies could be forced to embargo them? Total denial of all import and exports? Sanction all banks? Starve them out, it's a siege. With russia under greater financial burden, make them carry belarus as well, stoke a bit of tension.
Who do the russian state commanders have lined up for putin's replacement? It won't be a yeltsin, the massive alky clown.