China’s top diplomat on the US-Mexico border denounced protectionism as a dead end at the weekend, delivering a pointed defence of open trade just weeks before Mexico, the United States and Canada sit down to review the United States-Mexico-Canada Agreement (USMCA) that governs North American commerce. Consul General Fu Xinrong told a business gathering in Tijuana that unilateralism benefits no one and called on nations to build economic ties based on sovereignty and mutual respect rather than...