WHY IS IRAN COOPERATING WITH THE UNITED STATES?

The Islamic Republic would applaud the elimination of Iraqi weapons of mass destruction, which are credited for the Iranian decision to allow Iraq to win their war in the 1980s. Iran understands that these weapons are meant for it, as deterrent against invading Iraq, and establishing a Shiite regime. To that extent, Tehran could be seen as a silent U.S. ally. But not for long.

While Iran will not oppose an American invasion, the Islamic Republic would want to see democracy in Iraq, not a pro-American junta ruling the country.