The streets of Hanoi would have been empty when Kamala Harris was there last week. The city’s five million people are under lockdown as Vietnam, which has the lowest vaccination rate in Southeast Asia, grapples with the spread of the Delta variant. Events in Afghanistan increased the scrutiny on Harris, a potential future president with relatively little foreign policy experience. The tour of Singapore and Vietnam was her second foray abroad as VP. When she went to Guatemala and Mexico in June, she was criticised for telling would-be migrants not to attempt the journey to the US, and for deflecting questions about why she hadn’t visited the US-Mexico border by saying she’d ‘never been to Europe’ either.