1. The arrest of a top technology executive at the Chinese telecom giant Huawei threatened to upend a fragile trade truce with the U.S. — and put the Trump administration’s national security and trade policies on a collision course.

Huawei’s chief financial officer, the daughter of the company’s founder, was arrested in Canada. Washington is seeking her extradition, and U.S. officials said her arrest was the culmination of a monthslong investigation into whether Huawei violated Iran sanctions.

Chinese officials demanded her immediate release, and state media described the move as a “declaration of war.” Above, in Beijing.