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For more on this developing story, we are joined by professor Wu Xu, from Arizona State University.
1: Hello, Professor. Iran is blaming the new sanctions for its passenger planes being refused refuel in some countries. What do you make of this situation?
2: Authorities deny any official ban on refueling Iranian flights. They claim it is a commercial decision by BP which wants to comply with new US sanctions. Why has BP enforced the sanctions in certain countries and what message does this send?