Crimea is part of Ukraine now. This is not about the age of Charlemagne
Crimea is part of Russia now. As it had been for a long, long time.
It was only by one of Kruschev's diktat that it was assigned to the Ukrainian SSR in 1954.
It is worth noting that when Ukraine voted for independence with 92% in favor, the vote carried Crimea by only 54%.
I'm not willing to dismiss the idea that the current inhabitants are in favor of being part of Russia over Ukraine, even as they preferred being part of Ukraine over being part of the USSR.