You want the United States to be constitutionally obligated to defend a tiny, vulnerable piece of land on the other side of the planet that shared a border with our #1 enemy?
I mean, on one hand, it might hurt Putin's feelings and give him more reason to rattle an increasingly cracked and blunted saber, and could give Castro apologists cause to see this as some sort of "imperialist" conspiracy... but on the other hand, f#$k RuZZia and everything that it stands for, they did this to themselves and can no longer be taken seriously, much less trusted.
This would render the Black Sea into a NATO lake much the same way that the Baltic now is, and permanently crush any possibility of white-flagged ships bearing "Z"s and blue saltires from menacing the Mediterranean.
If the war reaches such a low point for Russia that America is able to set up a military base in Crimea and launch its own Black Sea fleet, Putin will have long since been killed anyway.
I wonder if anyone said similar things about Chiang Kai-Shek. And yet he ruled a rump state for another 26 years.