So... Uh... I didn't know that Chernobyl was spelled different in Ukrainian and thought they just made a typo on the title screen of the game when I saw "Heart of Chornobyl."
I didn't expect too much difference in the voices, as I wouldn't be able to tell Russian from Ukrainian (or even an accent) but it is weird hearing British and sorta kinda American accents all over the place after coming from the previous 3 games. It's like "Aw sweet, the Zone is multinational now!"