A huge challenge that both Ukraine and Russia is going to face is demography. Ukraine does not want to lower its conscription age from 25 to 18 because there aren’t that many male individuals in that age group already. The same works for Russia that suffered 300,000 causalities and a similar number of people (mostly young people) fleeing the country. So in any type of post-war scenario both countries will have to choice but to turn to foreign workers to rebuild their economies. Just like post WWII Germany. 
https://www.yahoo.com/news/russias-econo...18683.html

https://www.yahoo.com/news/russias-econo...18683.html
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