In a sunlight-filled classroom at the US State Department’s diplomacy school in late February, America’s cyber ambassador fielded urgent questions from US diplomats who were spending the week learning about the dizzying technological forces shaping their missions.“This portfolio is one of the most interesting and perhaps the most consequential at this moment in time,” Nathaniel Fick, the US ambassador-at-large for cyberspace and digital policy, told the roughly three dozen diplomats assembled be...