Kyiv may have been the homeland of the old Rus’, but that is as relevant to the later Russians as Rome being the homeland of the ancient Romans is to their Romanian descendants.
Also, Crimea is the homeland of the Tartars. The ethnic Russian majority in Crimea only dates back to 1944 when Stalin deported the Tartars and replaced them with more politically reliable Russian colonists.
There are probably only a few hectacres of Europe which have been the sole territory of any single ethnicity through recorded history.
Why has the Alsace-Lorraine been able to work out a coexistence unknown to the Kyev/Crimea?