North Korea has a secret, previously unreported missile base near its northern border with China, which could pose a “potential nuclear threat” to much of East Asia and the United States, according to a new report released Wednesday.

A Chinese man has been sentenced to eight years in jail for smuggling firearms to North Korea that he believed would be used in a surprise attack on South Korea, the US justice department has said. Shenghua Wen, 42, from California, admitted to receiving ...