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TOPSHOT - A Turkish-backed rebel fighter fires ammunition as buses arrive at the Abu al-Zindeen checkpoint near the northern Syrian town of al-Bab transporting Jaish al-Islam fighters and their families from the former rebel bastion's main town of Douma after being evacuated from the last rebel-held pocket in Eastern Ghouta on April 3, 2018.
Russia-backed regime forces have retaken control of 95 percent of Eastern Ghouta since February 18 through a combination of a deadly air and ground assault and evacuation deals. / AFP PHOTO / Nazeer al-Khatib        (Photo credit should read NAZEER AL-KHATIB/AFP/Getty Images)
TOPSHOT - A Turkish-backed rebel fighter fires ammunition as buses arrive at the Abu al-Zindeen checkpoint near the northern Syrian town of al-Bab transporting Jaish al-Islam fighters and their families from the former rebel bastion's main town of Douma after being evacuated from the last rebel-held pocket in Eastern Ghouta on April 3, 2018.
Russia-backed regime forces have retaken control of 95 percent of Eastern Ghouta since February 18 through a combination of a deadly air and ground assault and evacuation deals. / AFP PHOTO / Nazeer al-Khatib        (Photo credit should read NAZEER AL-KHATIB/AFP/Getty Images)

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All the players in Syria will make your head spin

Since it began in 2011, the war in Syria has only grown more and more complex. CNN's Nic Robertson explains who all the key players are.

All the players in Syria will make your head spin

Since it began in 2011, the war in Syria has only grown more and more complex. CNN's Nic Robertson explains who all the key players are.