The Crimea region was the only part of Ukraine that had a noticeable opposition (42% voted against independence). Even in the Eastern parts of Ukraine there was no region with more than 13% of votes against independence.
Donbas/Luhansk also ran referendums in 2014, along with Crimea, with ~90% support for independence. These polls were denounced as unconstitutional and illegal by Kiev.
And, while it was denounced as not a free and fair vote, realistically Kiev would not ever have allowed these votes to happen in any shape or form.
Not to mention the idea of holding a referendum with Russian troops occupying the area and no real outside observers is fundamentally off.
Even Kiev doesnt believe a vote without the troops would have had a markedly different result, which is why it rejects the idea of holding a vote at all on constitutional grounds.
Many in the USSR rejected the idea of Ukrainian independence based upon a similar principle of the inviolability of Soviet borders.
I don't know exactly what it would be or if it would be over 50%, but we should reject the obvious sham that Russia carried out.
Do you think that they are wrong?
Do you subscribe to Kyiv's view that holding a vote is a criminal offence?
Neutral sounds better than civil war.