Avoiding the questions whether the US has an issue in the Ukraine or not, and whether Putin had achieved his objectives in Georgia, the fact that President Bush could act as a he did was that by then the world knew that one could trust him to do what he said. Putin k-n-e-w that the US troops would really act as a tripwire.
If Obama would follow your advice I am afraid that could be a recipe for disaster. He has shown himself so weak during his previous five years in office that the Russians may well try and test him - something that could either lead to a world war - or massive loss of US prestige.
We still have some prestige?
I am shocked. lol