Actually it is common sense. Nuclear bombs are limited in how many square miles it can destroy. If Russia bombs just 12 cities in US, that will destroy 67% of US infra-structure and people. Russians can escape to spacious Sibera before sending nuclear armed hypersonic missiles to US. Nuclear war will be initiated by Russia and it will have the advantage of preparing and planning.
Mu point again is, US will suffer more damage and destruction than Russia in a nuclear war.
You forget that at least 90% of the Russian population live west of the Urals.
“At least 90 percent of Russia’s population lives west of the Ural Mountains. Those who live east of the Urals are primarily found in a 50-mile (81-kilometer) band on either side of the Trans-Siberian Railroad. Others are scattered in isolated settlements throughout the tundra.”
From:
Russia: regional distribution of population
geographyofrussia.com/regional-distribution-of-population/
geographyofrussia.com/regional-distribution-of-population/
You can hunker down in Russia along with BobL, who had said some months ago that in a nuclear exchange he would opt for his chances of survival in Russia, because they — according to him — have a great civil defense system.