Even if the Ukrainians won, there are a few consequences they'll have to contend with.
1. A heavily damaged country they'll need to rebuild.
2. Heavy military losses.
3. A weakened military.
4. Most of the returning men will have no chance of finding a wife, getting married or having children, considering that a large portion of the female Ukrainian population have left the country.
Highly likely to never return, starting better lives elsewhere.