NOTHING in your rationale justify a US declaration of war to Russia.
This would obviously have more potential risk than tiny Grenada, but my point is, our hands are not necessarily tied becasue of Obama's Leftist double-minded catatonic state. But we would have to have the attitude that we were in it to win it, else you end up with a Vietnam-type stalemate. If we weren't prepared to win, we should stay out and let Putin have his way. But at some point, we should be ready to step in if necessary - Putin seems to have more plans. Also, watch out for these other countries who are going to be emboldened by Obama's double-minded weakness.