Defying pressure from new United Nations sanctions, North Korea threatened to use nuclear weapons against the U.S. if militarily provoked and said it would “under no circumstances” negotiate on its nuclear and missile weapons programs.

North Korean Foreign Minister Ri Yong Ho on Monday delivered the strongly worded statement to reporters on the sidelines of an Asian regional security conference hours after U.S. Secretary of State Rex Tillerson vowed to implement the stiffest sanctions yet imposed on the Pyongyang regime.

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