Japan’s prime minister Shinzo Abe looks on as US president Barack Obama  hugs Shigeaki Mori, a survivor of the 1945 atomic bombing of Hiroshima, during a visit to the Hiroshima Peace Memorial Park on Friday. Photograph: Jim Watson/AFP/Getty Images

In the first Hiroshima visit by a sitting American president, Barack Obama made an impassioned plea for a world without nuclear weapons, asking for “c(...)