WASHINGTON - It's the fog of diplomacy.
For years, Iran has been an archenemy of the United States.
But now, with alliances blurred in the Mideast, the two countries are talking about how to stop an offensive in Iraq by al-Qaida-inspired insurgents.
How is it that adversaries that haven't trusted each other for 35 years could cooperate on Iraq today?
In the Syrian civil war, the U.S. backs the opposition. Iran supports the Syrian president.
The U.S. considers Iran a "state sponsor of terrorism." The U.S. says Iran bankrolls anti-Israel terrorist groups and other extremists intent on destabilizing the Middle East.
The U.S. has threatened Iran with military action if Iran approaches the capacity to develop nuclear weapons.
Yet the U.S. and Iran are more engaged diplomatically now than in years.