FILE - in this file photo dated Dec. 18, 2006, Palestinian Authority President Mahmoud Abbas, also known as Abu Mazen, left, flashes the V-sign as then Fatah leader, Mohammed Dahlan, looks on in the West Bank town of Ramallah. Serbian officials said Sunday Feb. 1, 2015, that Serbia has granted citizenship to Mohammed Dahlan, a key political rival of Palestinian President Mahmoud Abbas after he pledged millions of dollars in investments from the Emirates into Serbia, where he has lived in exile. (AP Photo/Kevin Frayer, FILE)