Most of the world has no "extradition treaties" with United States so it is not just Russia/China. They can be seen in the image below (grey countries) but things may not be that simple.

You have to remember that a lot of these countries (like Russia and China that you mentioned) cooperate with Interpol and will hand over criminals if there is a red notice issue on them.
I don't know if tax evasion would be a case for cooperation but a lot of other crimes (like maybe btc-e case) would.