Even Western pundits grudgingly admitted the summit between President Xi Jinping and North Korean leader Kim Jong-un was a success. Both sides, according to Bloomberg, “appear to have walked away with what they wanted”. Given China’s rising pre-eminence while avoiding any damaging war, it’s no surprise that Xi had the upper hand in his recent meetings with US President Donald Trump and Russian President Vladimir Putin. But with Kim, the stakes for Beijing were just as high, in light of Tokyo’s...