Seriously?
With what army or navy is Putin going to invade and occupy the whole of eastern Europe?
At best we have them in the Crimea, around their already existing military base at the request of this friendly ethnic Russian majority that has all but seceded from the rest of the Ukraine, that is in a civil war, and you have them marching practically into Vienna if we dont what?
If you are looking for a shooting war over this with Russia, then you need to snap out of it.
We don’t have to shoot it out with Russia anymore. What do you think all those space shuttle missions were about? Growing plants in space?
Obama will never use America’s shiney new toys, he just uses drones from the late 80’s and ‘91 Gulf wars.
And his reluctance has been calculated by some really nasty bullies in the global neighborhood.