Iraq was originally so trusting when a New York Times report accused Iran of flying military equipment through Iraq to aid Bashar al-Assad's government forces, but now it looks like they're a bit more suspicious.
Iraq has decided they're going to randomly inspect Iranian planes flying through their airspace for military equipment, or potentially personel, they could be delivering to help continue the Syrian conflict. When questions about the content of the Iranian deliveries to Syria first came up, Iraq didn't think much of it. At the time, an Iraqi government spokesman told the Associated Press "Tehran has assured [Iraqi president Nouri] al-Maliki that the flights are carrying only food and other humanitarian aid to help victims of Syria's civil war."
But, just two days ago, Reuters said a leaked an intelligence report alleges "tens of tons of weapons to arm the Syrian security forces and militias fighting against the rebels," were being flown in on a daily basis. Iraq have claimed no military equipment would fly through their borders to Syria. Now that it seems Iran is breaking that promise, Iraq is springing into action. A government spokesman informed Iran the planes would be subject to random testing from now on, according to the Associated Press. The move should satisfy western officials like John Kerry, who threatened Iraq with further sanctions earlier this week if they didn't do something to stop Iran from delivering military equipment through their airspace.