When Bashar al-Assad’s power was challenged in 2014, the Islamic State group filled the vacuum in Syria. Now the Assad regime has fallen, ending 50 years of rule by the family. Hayat Tahrir al-Sham, the rebel group who toppled the president, are now faced with governing a country occupied by various factions.On today's episode, Azadeh Moshiri speaks to Barry Marston, the head of the BBC's jihadist media team, to ask how much of a threat the Islamic State group is today, and whether this new power vacuum could present them with a new opportunity for their brand of terror?The Global Story brings you trusted insights from BBC journalists worldwide. We want your ideas, stories and experiences to help us understand and tell #TheGlobalStory. Email us at [email protected] You can also message us or leave a voice note via WhatsApp on +44 330 123 9480.Producers: Richard Moran and Eleanor SlySound engineer: Phillip BullAssistant editor: Sergi Forcada FreixasSenior news editor: Sara Wadeson