Russias population and military is far larger then that of Ukraine.
I think 100,000s or 1,000,000s could be spared if they surrender.
Then then could maybe negotiate to give up their eastern provinces in exchange for Russian withdrawal from the rest of the country.
I find it foolish that the government is giving guns to young boys, old men, and women to fight tanks and experienced Russian soldiers.
The Russian will kill most of those people, it will make Russians think all civilians are potentially targets, and it would only delay the inevitable.