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nuclear disarmament

North Korea is reportedly expanding a facility to build solid-fuel ballistic missiles — a further sign that despite last month's summit between President Trump and Kim Jong Un, Pyongyang is pressing ahead with its nuclear programs.

Updated 11:22 p.m. ET

President Trump's abrupt announcement he was calling off a June 12 summit with North Korea's leader was met Friday with an open invitation from North Korea to meet "at any time."

Trump's decision, which officials said Thursday was delivered in a letter directed to Kim Jong Un, prompted questions and dismay from world leaders.