China’s biggest technology companies gave a US congressional delegation the cold shoulder during a recent visit.Analysts said this decision – which denied the visitors a rare insider’s view of one of the world’s fastest-moving artificial intelligence ecosystems – reflected Beijing’s increasingly selective approach to AI diplomacy.It also highlights a paradox: while the two powers continue to pursue dialogue on AI safety, many of the channels that once helped them understand each other are steadily narrowing.The bipartisan delegation from the US-China Economic and Security Review Commission travelled to Beijing, Hangzhou and Shanghai earlier this month for the first visit of its...