Vali Nasser: The Tehran meeting was a great achievement for Iran Vali Nasser, Barack Obama's former advisor, referring to the meeting of the heads of Turkey, Saudi Arabia and Pakistan in Tehran, saw this event as a great achievement for Iran in terms of propaganda and communication. He also said that the Yemen issue at this meeting could bring results. Calling the event the "Tehran Summit" indicates that Iran may seek to shape a different regional order, according to Nasser.