https://www.rferl.org/a/life-expectancy-cis-report/24946030....
To put it into perspective, after ww2, the russian population recovered in a few years. The russian population today is still below their 1990 levels. In terms of population, life expectancy, quality of life, etc, ww2 (as horrible as it was ) was an insignificant blip. The fall of the soviet union has been a generational catastrophe for russia. A funk they seem unable to get out of demographically, economically, politically, etc.
https://www.macrotrends.net/countries/RUS/russia/population
In the US, our population has grown 50% since 1990 ( almost 150 more people ). The russian population has dropped 5% since 1990. After ww2, russia had major population growth like the US. After germany and japan lost ww2, their population, economy, etc improved drastically. For some reason, losing a hot war ( japan, germany ) turned out to be much better than losing a cold war ( russia ).
Think about it, we are nearly 2 generations into the post-soviet world and russia still hasn't recovered their population. After ww2, russia almost doubled their population in 2 generations. Losing the cold war appears to have demoralized the russian elite and people far more than losing ww2 did to germany and japan. Why? Who knows.