Kim Yo Jong, the influential younger sister and key adviser to the leader, issued the warning with inter-Korean ties in a deep freeze despite three summits in 2018 between her brother and the South’s President Moon Jae-in, who has consistently promoted engagement with Pyongyang. “The South Korean authorities will be forced to pay a dear price if they let this situation go on while making all sort of excuses,” Kim Yo Jong said in a statement carried by the official KCNA news agency.