CEP Senior Advisor Sir Ivor Roberts writes: "After the fall of Kabul, every jihadist group with whom the West has battled over the past 20 years will take heart and inspiration from the West’s retreat and inevitably pursue their jihadist agenda more aggressively and actively. Not just in Western cities but in South East Asia and Africa. Boko Haram in Nigeria will have cheered the Taliban victory to the rafters."