you should also take into account that reunification is seen unacceptable by Russian public opinion until Ukrainians beg us long and hard, as it was in 1600s.
in present situation to make it possible Ukrainians must live for quite a time without heating in winter, without electricity, without bridges, power stations, industries, generally - without infrastructure and industry. And without food.
are you sure you will succed in achieving it by yourselves or some friendly fire is required from Russia?
Generally, if Ukraine finally manages to drag Russia into the war - we will unlikely spare territories which we are not going to control.
And vice versa, future Russian lands of what is called Ukraine now can count on Russian efforts to preserve local infrastructure and industry.
I suspect there will not be any occupation. There will be American style weeks and months long destruction of Ukraine. With no Russian casuslties.
With possible nuclear strikes if Americans/NATO suddenly decide to get involved and attack Russian territory.
Stikes first in Ukrainian territory against Anerican/NATO troops.
Frankly saying I don't understand why these idiots in the West think that nuclear weapons are a toy which we spend a lot of money on just to have, without perspective of using it...
I mean be cateful about your wishes, that curved line can easily be a border between inhabited Russia and uninhabited Wild Steppe, as it was for centuries...