Diplomats for China and the US in Latin America have traded brickbats on social media over alleged espionage risks posed by Chinese tech firms in the region, in the latest sign of the two powers’ unfolding strategic tensions in the western hemisphere. US assistant secretary of state for western hemisphere affairs Juan Pablo Segura named telecoms giants Huawei Technologies, ZTE and Hytera, surveillance equipment makers Hikvision and Dahua, and drone heavyweight DJI in a post on social media on...