Great comment.
This is not well thought out.
The loss of Crimea and the other oblasts joining Russia is where the pro Russia votes were that elected pro Russia candidates in Ukraine pre 2014. Those votes are gone.
They are one now, as well as the millions of refugees that have fled Ukraine and gone to Russia. Then other refugees who fled to Europe. They won’t vote, and if they did those votes coming from Russia won’t be counted.
I don’t see why a Zelensky election loss is likely.