Out of interest, I looked into Crimea's post-referendum attitude, and in every poll, well over the majority are happier with Russia.

Here's a few articles:

https://www.forbes.com/sites/kenrapoza/2015/03/20/one-year-after-russia-annexed-crimea-locals-prefer-moscow-to-kiev/?sh=5eb1916e510d

http://www.parisglobalist.org/post-referendum-crimea-and-its-russian-future-voices-from-the-inside/

https://www.foreignaffairs.com/articles/ukraine/2020-04-03/russia-love