FILE - In this Jan. 18, 2011 file photo, a protestor faces riot police officers during a demonstration against the party of Tunisian ruler Ben Ali, in the center of Tunis, Tunisia. Ten years ago, an uprising in Tunisia opened the way for a wave of popular revolts against authoritarian rulers across the Middle East known as the Arab Spring. For a brief window as leaders fell, it seemed the move toward greater democracy was irreversible. Instead, the region saw its most destructive decade of the modern era. (AP Photo/Christophe Ena, File)