I agree that it does not make sense to antagonize Russia, but am curious to know what cooperation Russia can provide when it comes to Iran and the nuclear file. Do you mean it could tell what weapons or parts of weapons Russian states have in the past clandestinely sold to Iran? Or that it could turn around and to spite the West suddenly sell it weapons grade uranium, running the risk that an Iranian nuclear or dirty bomb would be used against them, perhaps by Chechnyan terrorists?

I'd like a peaceful resolution to Iran and would like to know more about the leverage Russia has here.

"When men yield up the privilege of thinking, the last shadow of liberty quits the horizon." Thomas Paine