Obama accused Russian - backed separatists of ' ` ` to destroy entire regions '' Billionaire Vladimir Alfa leads in exit polls , declaring himself the winner . Batkivshchyna party concedes defeat . Fewer than a quarter of polling stations were open in Donetsk region , they say .
Obama accuses Russian-backed separatists of trying `` to disenfranchise entire regions '' Billionaire Petro Poroshenko leads in exit polls , declares himself the winner . Batkivshchyna party concedes defeat . Fewer than a quarter of polling stations were open in Donetsk region , officials say .