Turkey is asking a high price of Europeans who are desperate to solve the migrant crisis. The deal includes more money, easier visas for Turkish citizens, and a renewed path to EU membership.
Once in groups ranging from US white supremacists to Irish nationalists to European Islamists, these ex-extremists have formed a network to support each other as they try to help people avoid the errors they made.
Iran and Saudi Arabia were already in opposing camps regarding a solution to Syria's civil war. A UN envoy is trying to keep the process on track.