You can frantically hope all you want, but decades of consistently taught Russian Military doctrine indicates that Russia will use nukes to retain Crimea if it requires that. If the military has to install a new premier to do so.
Sometimes sticking your head in the sand and shouting la la la la accomplishes nothing whatsoever.
Perhaps you can point to where I said the U. S. or anyone else should retake Crimea from Russia.
Under the current situation, the U. S. nor NATO is shaping up to confront Russian in any meaningful way.
No, I don’t see Russia using nukes. The Mad Doctrine is still playing out today.
As for the Russian military, it hasn’t exactly impressed in Eastern Ukraine.