You want to see Russian birth rate but after victory, the Ukrainian men will return home to their wives and partners drink loads of vodka and a baby boom will happenOttoman empire was destroyed in WW1. German empire was destroyed in WW1. British and French empires were destroyed in WW2.
Too many men in the army and women will have no children. Birth rate will be practically 0. 10 years from now war is still going on and Ukraine population fall to less than 20 million.