Sounds like there's some sort of wrangle about the ownership and lease of the rig. I remember Iranians in my dorm, before the fall of the Shah. They were assholes then, they are assholes now. They have to be the hardest bunch of assholes in the world to deal with. Anybody doing business with the Iranians is asking for trouble.
Looks that way, business deals from the barrel of a gun.