Patrick Lancaster - witness to Crimean referendum in 2014 to join Russia:
The US claims it was a fake referendum by force from "little green men" from Russia threatening the local Crimean population.
People in Crimea born before 1954 were actually born in Russia.
Most Crimeans consider the 1954 hand-over to Ukraine as an illegal handover.
https://youtu.be/lg9jWsgQdb4?t=292
Even so, at the end of the USSR, Crimea was still mainly Russian and should have gone to Russia by consideration of the will and ethnicity of the people, the investment of Russia in shipping and defense, and the necessity of a warm water port - which Ukraine already had and did not need Crimea.