US President Donald Trump hogged the headlines at the G20 summit in Osaka with, first, his back-down in the trade war with China and then a supposedly unscripted meeting with North Korean dictator Kim Jong Un and a historic step into the northern kingdom. But if Mr Trump’s decision to partially lift the ban on Chinese 5G equipment maker Huawei, the resumption of trade talks with China and unilateral concession to Pyongyang were seen as potent signs of a diminution of US power, a reminder of its clout was embedded in the Osaka communique. Mr Trump’s trade war with China