Speculation about health builds after Kim misses key event honouring country’s founder, Kim Il-sung... Kim Jong-un underwent heart surgery earlier this month and is recovering at his private villa, according to a South Korean report, with US media citing officials as saying the North Korean leader was in “grave danger” after the procedure. If accurate, the surgery claim, made by the Daily NK website, would explain Kim’s absence from an event to mark the anniversary of the birth of his grandfather – and the country’s founder – Kim Il-sung. Kim Jong-un underwent the procedure at a hospital in the county...