Staffan de Mistura says a UN plan to `` freeze '' fighting in Damascus `` merits consideration '' UN plan calls for local `` freeze '' zones to allow humanitarian aid . al-Assad envoy calls talks with UN `` constructive '' Parts of Aleppo are still a stronghold for Syrian rebels .
Bashar al-Assad says a UN plan to `` freeze '' fighting in Aleppo `` merits consideration '' UN plan calls for local `` freeze '' zones to allow humanitarian aid . UN envoy calls talks with al-Assad `` constructive '' Parts of Aleppo are still a stronghold for Syrian rebels .