The militant group’s leader admits that the toppling of Syria’s president, Bashar al-Assad, cut off an important land route from Iran.

The ascendance of Sunni Islamist rebels in Syria should be viewed with great caution by Western powers, but the Assad regime’s collapse disables a critical node in Iran’s regional proxy network, a counterterrorism expert explains.

Hezbollah head Naim Qassem said on Saturday that the Lebanese armed group had lost its supply route through Syria, in his first comments since the toppling of President Bashar al-Assad nearly a week ago by a sweeping rebel offensive.