Protectionist racket: trade-war rhetoric

As President Donald Trump threatens new tariffs on Mexican goods, retaliatory ones between China and America are starting to bite. That puts China’s party leaders—and their hardening nationalist message—in a tricky spot. We examine how the global grounding of Boeing’s 737 MAX planes might change air-safety regulation. And a visit to Venice’s Biennale, where immigration and climate change are taking centre stage.