In April 1975, King Khalid's first diplomatic coup was the conclusion of a demarcation agreement concerning the Al Buraymi Oasis, where the frontiers of Abu Dhabi, Oman and Saudi Arabia meet. Claims and counterclaims over this frontier had exacerbated relations among them for years. Therefore, King Khalid aimed at settling this long-standing boundary disputes. The conclusion of negotiations under King Khalid added to his stature as a statesman. Another significant event was the visit of Shah Mohammad Reza Pahlavi of Iran to Riyadh on 28 April 1975. In June 1975 Saudi Arabia appointed an ambassador to the United Arab Emirates which also assigned an ambassador to Saudi Arabia the same date.