If the rise of Islamic State can overthrow powerful states in a matter of weeks, what kind of a secure future can the world expect? After more than a decade of the war on terror, security specialists thought that Islamist paramilitary movements were in decline; the threat from ISIS in Syria and Iraq, Boko Haram in Nigeria, al-Qaida in Yemen, the chaos in Libya and the return of the Taliban in Afghanistan have all shown that to be wishful thinking...