China weighs how best to bolt the back door to terrorists from Afghanistan

China has stepped up defences on its border with Afghanistan to guard against potential terrorist threats, given the turmoil after Kabul’s sudden fall to the Taliban. But the narrow Afghan-Chinese frontier is not the only entry point, with less reinforced borders between Afghanistan and its other neighbours, such as Tajikistan, representing a challenge for the region’s security alliances.There are growing concerns for the Chinese government that instability in landlocked Afghanistan following…