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After months of fighting, the Islamic State group's self-proclaimed capital Raqqa has been seized by a US-backed Syrian militia. How big a moment is this in the fight against the jihadists? Shashank Joshi is a senior research fellow at the Royal United Services Institute, a foreign affairs think tank in the UK.

(Photo: A member of the Syrian Democratic Forces, backed by US special forces, holds up their flag at in Raqqa. Credit: Bulent Kilic/AFP/Getty Images)