The ghastly suicide attacks outside the chaos-ridden Kabul airport are reminders that the threat of jihadist terrorism has grown since the US’s disastrous exit from Afghanistan and the return of Taliban to power. Having claimed victims as wide-ranging as departing American soldiers, Afghan civilians and Taliban fighters, these audacious strikes highlight the menace of the Islamic State-Khorasan (ISIS-K) and other boundary-defying terrorist groups to the stability of not just Afghanistan but its extended neighborhood.