North Korea has constructed a secret military base near its border with China, according to new research from the Center for Strategic and International Studies. The Sinpung-dong Missile Operating Base, located in North Pyongan Province, is believed to house six to nine nuclear-capable intercontinental ballistic missiles and their launchers. The report warns that these weapons could pose a nuclear threat to East Asia and the continental United States. This development comes as North Korea accelerates its nuclear weapons program, with leader Kim Jong Un calling for a rapid expansion of the country's nuclear capabilities.