This article in the NYRB caught my attention and is strongly recommended
Georgia and the Balance of Power
The Russian invasion of Georgia has not changed the balance of power in Eurasia. It has simply announced that the balance of power had already shifted. The United States has been absorbed in its wars in Iraq and Afghanistan, as well as potential conflict with Iran and a destabilizing situation in Pakistan. It has no strategic ground forces in reserve and is in no position to intervene on the Russian periphery. This has opened an opportunity for the Russians to reassert their influence in the former Soviet sphere. Moscow did not have to concern itself with the potential response of the United States or Europe; hence, the balance of power had already shifted, and it was up to the Russians when to make this public. They did that on August 8.