FILE - In this April 27, 2018, file photo, North Korean leader Kim Jong Un signs a guestbook next to his sister Kim Yo Jong, right, inside the Peace House at the border village of Panmunjom in Demilitarized Zone. With North Korea saying nothing so far about outside media reports that leader Kim Jong Un may be unwell, there’s renewed worry about who’s next in line to run a nuclear-armed country that’s been ruled by the same family for seven decades. (Korea Summit Press Pool via AP, File)