In an interview on '60 Minutes,' the Syrian president claimed that IS was expanding and gaining more recruits. He also expressed optimism about 'dialogue' with the US.
Syria's largest city is contested by various rebel groups, including anti-US jihadists. A UN envoy is trying to broker a temporary cease-fire so that humanitarian aid can reach civilians.
The Sunni militant group, ISIS, has stepped up its attacks on Christians during fierce fighting in Syria's northeast.
Monitoring groups say militants have kidnapped at least 70 people from Assyrian Christian villages that border territory that IS controls in Iraq. Some speculate IS may be seeking a prisoner swap.
Islamic State militants released a video Tuesday showing the burning to death of a captured Jordanian pilot, igniting anger across the Arab region, but also raising doubts among US coalition allies.
The self-styled Islamic State was trying to send a message by burning Lt. Muath al-Kassasbeh alive. It seems Jordanians are listening.
The situation looks grim for a Jordanian pilot and a Japanese journalist who the Islamic State are trying to use to gain the release of a woman who helped murder 58 people in Amman in 2005.