>>510551604 (OP)basically it was a common hobby of communist leaders to rewrite borders in their free time, creating unresolvable ethnic tensions unless one side just surrenders unconditionally (like it happened in Artsakh)
Crimea was basically not much more than a birthday gift from Khrushchev to his Ukrainian wife, while the left bank of the Dnepr was always culturally and linguistically tied to Russia more than Ukraine, therefore a Janus-faced state was born in 1991 that pretty much switched its allegiance between Moscow and Washington after every single election until that particular revolt happened in Kiev which triggered nationalist millitance on both sides