With China and the US agreeing to extend a tariff truce that was set to expire in November – and US President Donald Trump giving his Chinese counterpart, Xi Jinping, a personal welcome on the tarmac – analysts say the Chinese leader’s state visit has begun on a positive note.The extension will run for two months through January 10, a sign the world’s two largest economies are willing to negotiate broader agreements and build positive momentum despite an increasingly heightened rivalry spanning...