Huawei arrest threatens global markets, Trump-China trade truce

At a time of maximum tension in the U.S.-China relationship, news of the arrest last weekend of a top Chinese tech official in Canada managed to set off multiple shock waves Thursday, shining a harsh light on U.S. and allied concerns about Chinese state-backed corporate giants, massively complicating a trade war 'truce' just negotiated by President Trump and Chinese President Xi Jinping, and — for a few hours — threatening to buckle global stock markets and wipe out a big chunk of the recent Wall Street gains Mr. Trump is fond of trumpeting.