Interesting history. But beyond silly as law. Europe would look very different if based on 1789 treaties.
But a bigger take away is that since the era of Catherine the Great, Russia has controlled Crimea.
That’s why this case of the vapors will go nowhere. Its been home to the Russian fleet since it had tall ships,,, with sails.
I completely agree - that old Treaty is long since obsolete - but it is a record of claims which are still valid in the eyes of some nations in the Middle East - especially Turkey.
Turkey sees itself as the protector of the Tatar people of the Crimea. They, in turn, are Muslim and anti-Russian. Many of them managed to return to the homeland after decades of exile, as described in that article, and they are now a growing Crimean minority.