North Korea could conduct nuclear test 'any time', says US envoy

North Korea has test-launched an unprecedented number of ballistic missiles this year, says US Special Representative for North Korea

North Korea could conduct a seventh nuclear test at "any time" and has shown no interest in returning to negotiations, the U.S. Special Representative for North Korea said on Tuesday.

North Korea has test-launched an unprecedented number of ballistic missiles this year and its officials have also used rhetoric that could suggest plans for the use of tactical nuclear weapons, Sung Kim told reporters.

Kim reiterated U.S. assessments that North Korea was preparing to conduct a seventh nuclear test.

Asked when that might happen, he said: "I don't have anything more. They've obviously done the preparations..., and my understanding is they could test