[quote=Omega]
Ukraine has a strong ethnic Russian minority in many eastern regions they will find popular support through all of Southern Ukraine and could take almost everything east of the Dnieper almost with a fight as they have mobilized over 150,000 soldiers to Ukraine's current 145,000 with local support generally going to the Russians until you cross the Dnieper.
[/quote]

Which is pretty much due to Soviet forced migrations in order to create just this situation.