In this Wednesday, Nov. 14, 2012, file photo, Syrian fighters of "The Beloved of Allah," brigade hold their weapons before fighting with government forces on the outskirts of Aleppo. 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. Syria, Yemen, Libya and Iraq have been torn apart by wars, displacement and humanitarian crisis. (AP Photo/Khalil Hamra, File)