HONG KONG/BEIJING – On the same day Donald Trump and Xi Jinping struck a trade war truce in Argentina, some 7,000 miles away Canadian authorities made an arrest that now threatens to make the U.S.-China conflict much worse. The U.S. is seeking the extradition of Meng Wanzhou, chief financial officer of Huawei Technologies Co., after convincing Canada to arrest her on Dec. 1 in connection with violating sanctions against Iran. China reacted with outrage on Wednesday, demanding that both countries move to free Meng immediately. It's hard to overstate the significance of her arrest in Beijing: Meng is the daughter of the founder of Huawei, a national champion at the forefront of Xi's efforts for China to be self-sufficient in strategic technologies. While the U.S. routinely asks allies to extradite drug lords, arms dealers and other criminals, arresting a major Chinese executive like this is rare -- if not unprecedented.