Crimea has been Russian since WW II when Josef Stalin deported Crimean families, manyof whom were Tatars, to Central Asia and replaced the population with Russians. In my opinion that is a done deal like the North America genocide of Native Americans by Europeans, the genocide of Armenians by Turks, and many other genocides. Crimea, owing to its location on a major trade route, has been overrun time and again by armies of various peoples. Ukraine is a horse of a different color. It's language is separated from Russian by 3 - 4 centuries. Lenin's armies took it over by starving millions of Ukrainians to death in one of his pogroms. That's history, friend.

My figures on nuclear weapons by nation came from this site:  https://www.armscontrol.org/factsheets/Nuclearweaponswhohaswhat