Otto Warmbier, the 22-year-old US student released by North Korea in a coma after more than a year in detention, has died. Warmbier was arrested at Pyongyang airport in January 2016 and sentenced to hard labour for allegedly taking a propaganda poster from his hotel room. North Korea claim he fell into a coma after he took a sleeping pill and contracted botulism, an assertion his family reject. Donald Trump, US president, has condemned the regime as “brutal” and promised: “We’ll handle it.”