I believe it's established that the eastern parts of Ukraine are more pro-Russia than the western parts. (please correct me if I misunderstood that) Does the annexation of Crimea and the potential upcoming Russian attack + occupation change the voting balance significantly? Can we realistically expect further annexation of Donetsk or other parts to result in election of Ukrainian politicians interested in bigger deals with EU or more keen on joining NATO?
Or if that's too hard to answer, a more specific version of that question: how different were past Crimea/Donetsk/Luhansk votes from the rest of the country?