[VeniVidiVici]

Is there a single oblast in the Ukraine that is dominated by Russian speakers?

[Cronos]

it's not that simple. By dominated -- do you mean raw numbers? Or economically and politically?

Also, there are Russian speakers who call themselves Ukrainian (I don't understand it, but there are) and there are Ukrainian speakers who may have some attachment to Russia perhaps mostly economically.

it's just not that simple Russians and Ukrainians