I’m pretty sure Russia will stop at the Dnieper because they don’t want to occupy a bunch of angry Ukrainians. They just want the ethnic Russians.
Funny thing, you control a country like Ukraine was by Soviet Union for decades, you deport, exile, imprison, murder much of the indigenous people, then your people swoop in and take their place and you do this for decades later you say
We are invading to protect ethnic russians.
Nice party trick