A major offensive has seen rebel groups in Syria retake the country’s second city, Aleppo – and demonstrated the growing prominence of the Islamist group Hayat Tahrir al-Sham in the 13-year-long civil war.

Assad Syria, transitioning from insurgency to governance amid challenges of legitimacy, recognition, and internal opposition.

Sir Keir noted that while it was 'very good' that Assad was gone, it didn't mean that what follows was settled by any means.

Qaeda, led the offensive against Assad but now faces challenges in governance and legitimacy amidst Syria's long-standing instability.