Bah, Georgia is forgeted :/
USA won't do anything but giving them some moral support. Hey, wake up! It's Russia! Just because the Cold War is over, and there's no Soviet Union and a huge percentage of the Soviet nuclear warheads went missing, they still can bite hard. That's why Hungary got no support back in 1956 ( I admit, there was the Suez crCIA which contributed a lot to it), and that's why Georgia might be left alone by the United States.
Also, the US is involved in two major conflicts, and however surprising it may sound, the US has its own limits, even though they are capable of doing far more things compared to other countries.