North Korea has quietly built and operated a sprawling long-range missile base near the Chinese border that stores Kim Jong Un’s most advanced strategic weapons, demonstrating the regime’s ongoing efforts to advance its nuclear strike capabilities, a think tank said.

The base in Sinpung, North Pyongan Province, located 27 kilometers (17 miles) from the border with China, likely houses a brigade-sized unit equipped with six to nine nuclear-capable intercontinental ballistic missiles and their mobile launchers, a report by the Center for Strategic and International Studies showed Wednesday. “These missiles pose a potential nuclear threat to East Asia and the continental United States,” the report said.

“Current assessments are that during times of crisis or war, these launchers and missile

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