China has huge influence in Iran. Iran is building nuclear weapons and the US asked China to use that influence. China said "no". Obama is selling 6 billion dollars plus of weapons to Taiwan. China said, "Stop". China depends on US technology. Obama says "Tell Iran to stop and we will". Classic example of "political hardball". Bush and the Republicans only tried the "stick", never the "carrot". Can China Follow Through On U.S. Sanctions? It will be interesting to see what happens next.