Ukraine and russian?

Yes, there is but it isn't very big. The languages are very similar and russians can understand what ukranians are generally saying and vise versa. They also use the same alphabet and many of the words are the same. I dont think it matters which you would want to learn because tehy are similar, bother languages have some words that aren't in the other so if you learn one, it will be easier for you to learn the other.