Syria: After the takeover of Aleppo and Hama, what main challenges for HTS?

Syrian rebels led by Islamist group Hayat Tahrir al-Sham (HTS) captured the key city of Hama on Thursday, bringing the insurgents a major victory after a lightning advance across northern Syria and dealing a new blow to President Bashar al-Assad and his Russian and Iranian allies. FRANCE 24’s Expert Wassim Nasr tells us more about the main challenges facing the rebels.