The United States has an interest in acting early because early action is cheaper than acting in the last extremity. This is a case of anti-air missiles, attack helicopters, communications systems and training, among other things. These are things the United States has in abundance. It is not a case of deploying divisions, of which it has few. The Poles, Romanians, Azerbaijanis and certainly the Turks can defend themselves. 

read more: Stratfor