File - In this Wednesday, Nov. 23, 2011 file photo, an Egyptian protester using scrap metal as a shield takes cover from tear gas during clashes with security forces near Tahrir Square in Cairo, Egypt. 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)

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)

FILE - In this Oct. 10, 2010 file photo, Libyan leader Moammar Gadhafi, center, with Egyptian President Hosni Mubarak, right, and his Yemeni counterpart Ali Abdullah Saleh, left, pose during a group picture with Arab and African leaders during the second Afro-Arab summit in Sirte, Libya. In 2011, 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/Amr Nabil, File)

FILE - In this Jan. 28, 2011 file photo, anti-government activists clash with riot police in Cairo, Egypt, to challenge President Hosni Mubarak's 30-year rule. 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/Ben Curtis)

FILE - in this March 4, 2011 file photo, Libyan rebels who are part of the forces against Libyan leader Moammar Gadhafi stand with an anti-aircraft gun as they prepare to fight on the front-line near Ras Lanuf, west of the town of Brega, eastern Libya. 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/Kevin Frayer, File)

FILE - In this March 26, 2011 file photo, anti-government protestors react during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen. 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/Muhammed Muheisen, File)

FILE - In this Sept. 7, 2015 file photo, Syrian refugees wait at the port of Lesbos island, Greece, to board a ferry traveling to Athens. 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/Petros Giannakouris, File)

FILE - In this Jan. 29, 2011 file photo, anti-government protesters gather in Tahrir Square, Cairo, Egypt. 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/Ben Curtis, File)

File - In this Friday, March 18, 2011 file photo, an anti-government protestor reacts as others carry a wounded protestor from the site of clashes with security forces in Sanaa, Yemen. 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/Muhammed Muheisen)

EDS NOTE: GRAPHIC CONTENT - FILE - In this Oct. 21, 2011, file photo, the body of Libyan dictator Moammar Gadhafi lies on a mattress in a commercial freezer at a shopping center in Misrata, Libya. 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/Manu Brabo, File)

File - In this Saturday, Oct. 22, 2011 file photo, buildings ravaged by fighting are seen through another damaged building in Sirte, Libya. 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/Manu Brabo)

FILE - In this Feb. 11, 2011 file photo, anti-government protesters perform the Muslim Friday prayers at the continuing demonstration in Tahrir Square, Cairo, Egypt. 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/Tara Todras-Whitehill)

FILE - In this Oct. 4, 2016 file photo, oil fields in the town of Qayyarah burn, nearly a month after fleeing Islamic State militants set fire to the oil. 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/Bram Janssen, File)

FILE - In this July 3, 2016 file photo, Iraqi firefighters and civilians carry bodies of people killed in a car bomb at a commercial area in Karada neighborhood, Baghdad, Iraq. 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/Khalid Mohammed, File)

FILE - In this Oct. 20, 2016 file photo, Iraqi army soldiers raise their weapons in celebration after a pre-dawn advance on the nearby town held by the Islamic State group, on the outskirts of Mosul, Iraq. 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, File)

FILE - In this Jan. 28, 2011 file photo, an Egyptian anti-government activist kisses a riot police officer following clashes in Cairo, Egypt. 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/Lefteris Pitarakis, File)

FILE - In this March 29, 2011, file photo, a Libyan rebel urges people to leave as shelling from Gadhafi's forces started landing on the frontline outside of Bin Jawaad, 150 kilometers (93 miles) east of Sirte, central Libya. 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/Anja Niedringhaus, File)

FILE - In this Wednesday, Aug. 15, 2012 file photo, injured Syrian women arrive at a field hospital after an air strike hit their homes in the town of Azaz, on the outskirts of Aleppo, Syria. 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)

FILE - In this Tuesday, Feb. 22, 2011, file photo, Yemeni anti-government demonstrators shout at supporters of President Ali Abdullah Saleh as they gather on top and around a destroyed vehicle during clashes in Sanaa, Yemen. 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/Muhammed Muheisen, File)

FILE - In this Friday, March 18, 2011, file photo, wounded anti-government protesters lie on the ground as they receive medical help at a field hospital during clashes with security forces in Sanaa, Yemen. 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/Muhammed Muheisen, File)

FILE - A supporter of Syrian President Bashar Assad waves a Syrian flag as she looks over a crowd gathered to show support for their president in Damascus, Syria, Tuesday, March 29, 2011. 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/Bassem Tellawi, File)

File - In this Wednesday, Oct. 19, 2011 file photo, Libyan rebel fighters fire their machine guns toward loyalist positions down town Sirte, Libya. 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/Manu Brado, File )

File - In this Thursday, Oct. 20, 2011 file photo, Mohammed al-Babi holds a golden pistol he says belonged to Moammar Gadhafi in Sirte, Libya. 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/Manu Brabo)

File - In this Sunday Oct. 23, 2011 file photo, Libyan celebrate at Saha Kish Square in Benghazi, Libya, as Libya's transitional government declares the official liberation of Libya after months of bloodshed that culminated in the death of longtime leader Moammar Gadhafi. 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/Francois Mori, File)

File - In this Friday, Feb. 3, 2012 file photo, an Egyptian protestor climbs a pole waving his national flag during a demonstration in Tahrir Square, Cairo, Egypt. 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/Nathalie Bardou, File)

FILE - In this Thursday, Jan. 26, 201, file photo, Syrian army defectors, celebrate shortly after they defected and join the anti-Syrian regime protesters at Khaldiyeh area in Homs province, central Syria. 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, File)

File - In this Thursday, Nov. 24, 2011 file photo, Egyptian protesters stand behind a barbed wire barricade in Tahrir Square in Cairo, Egypt. 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/Mohammed Abu Zaid)

File - In this Friday, March 2, 2012 file photo, a Yemeni walks past a graffiti that reads "Freedom is made by people" on a street where protestors demanded the trial for the former President Ali Abdullah Saleh, in Sanaa, Yemen. 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/Hani Mohammed, File)

FILE - In this Sunday, March 11, 2012 file photo, Syrian rebels take position during clashes with Syrian Army forces in Idlib, north Syria. 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/Rodrigo Abd, File)

FILE - In this Feb. 2, 2011 file photo, pro-government demonstrators, below, clash with anti-government demonstrators, above, as an Egyptian Army soldier on the rooftop of the Egyptian Museum observes the scene in Tahrir square, the center of anti-government demonstrations, in Cairo, Egypt. 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/Ben Curtis, File)

File - In this Friday, Aug. 17, 2012 file photo, Yemeni volunteers prepare to bury the bodies of unidentified people who were killed during the last year's clashes between government forces and tribal militants at a mass funeral in Sanaa, Yemen.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/Hani Mohammed, File)

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)

In this Saturday, Nov. 17, 2012 file photo, a Syrian fighter shoots during clashes with Syrian army forces in the town of Harem on the outskirts of Idlib, Syria. 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)

FILE - In this Jan.16, 2011 file photo, a torn banner of former Tunisian President Zine El Abidine Ben Ali is seen in the center of Tunis. 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/Christophe Ena, File)