It doesn’t matter what the people want, it is still Ukrainian territory3 points:
1. you have to remember despite the claims otherwise that a large percentage of people in Donbas want to be part of Russia, that’s not going to change in 5-10 years. Most have Russian passports now anyway. You won’t need to import people to maintain that balance.
2. The newly integrated areas are now formally part of Russia - no president can just write that off by walking away.
3. You must be joking if you think there are 40 million Ukrainians left. In terms of those that actually support the conflict against Russia I’d reckon there’s no more than 15-20 million left.
Formally part of Russia?? Lol, sham elections that the world does not recognise. It is still Ukrainian territory
Your man and his plan are finished