President Donald Trump signs an executive order at a news conference unveiling his first extensive tariffs program, outside the White House on April 2, 2025. The president seems as intent on tariffs as ever and argues that his trade agenda is succeeding, despite little evidence to support it. (Haiyun Jiang/The New York Times) By JEANNA SMIALEK European officials have been hoping that 2026 would bring a measure of calm after a year of trans-Atlantic chaos. But even as many in Europe welcomed a...