"Wonder if they have a supporting role with respect to the insurgents in Iraq."
I doubt that, but believe the Russians do. The Russians and Chinese cooperate much more than people generally realize. Iraq is more in the Russian sphere of influence.
Eh.
China's everywhere these days. They've got 10,000 troops in the Sudan, an alliance with Venezuala, etc.
They're probably providing support, probably through third parties (IE - Iran or Syria).
I am not so sure that China is not discretely helping the "insurgents". China was very much involved with the Saddam regime, helping with anti US radar systems and hardening communication lines in the no-fly zone. Not that it helped Saddam much heh heh.