Under Sheikh Nasrallah, Hezbollah rode to the defense of its ally Syria. But the Shiite group that was founded to confront Israel is paying a high price in lives and prestige.
Fadel Shaker's about-face stands as a symbol of a wider crisis facing jihadist groups in Syria. Dozens of Saudis and more than 100 Jordanians have reportedly defected as well.
Unnamed officials say authorities detained family members of the Islamic State's Abu Bakr al-Baghdadi at the Syrian-Lebanese border.