Chinese strongman Xi Jinping has a terrible weakness – and his name is Kim Jong Un. This is supposed to be the Chinese President’s big moment. Not since Deng Xiaoping’s day has a mainland leader controlled, well, everything – foreign affairs, the economy, the military, censorship policy, you name it. United States President Donald Trump’s erratic White House and his scrapping of trade and climate-change deals, meanwhile, makes Mr Xi’s team look like the adults in the room. Except for that Kim fellow, whose antics in Pyongyang have strongman Xi looking befuddled and downright cowed.