Its all about self-determination. Look at it this way: the request comes from the Ukrainians themselves. If the Russians send in the tanks, it will take place after the treaties are signed, sealed and delivered.
If the T-90 tanks roll in it will not be an invasion but more like a Victory Parade. If is not the word—when. The Duma may approve of it after all the hysteria whipped up by Putin and his party. Lugansk is next—The land bridge to Criema is being built. I only hope the People get a better deal from Moscow than they did from Kiev. It looks like they want stability more than nationalism. Nothing we can really do but watch. After this Putin will take a break as he digests these conquests. Look to see more Russia-Egypt moves or Russia-Cuba moves. Russia will hand the baton to China—you will see more action in the south China Sea and India.