China’s dilemma: how much pressure can it exert on its historical ally, North Korea?

China hit back this week against fresh North Korea-related sanctions by the United States, which targeted six Chinese firms and one individual for supporting Pyongyang’s weapons programme.
It called on Washington to “immediately correct its mistake” of enacting these sanctions, opening Beijing to renewed criticism that it has been reluctant to exert greater pressure on its authoritarian neighbour.
China has increasingly had to contend with its complicated relationship with the…