Iran does have options. They will not go quietly. But China will only get involved in a limited fashion. They just can't jeopardize all that money they make off us. Not over Iran. Now if we were talking about Taiwan? That's a whole different story. But they can't risk so much over Iran. Now Russia on the other hand,could be a problem.
Especially with Putin making his move for the Russian presidency again...and his dim view of the West.