It said it had mastered the ability to mount a warhead on a ballistic missile.

  A seismic event may indicate that North Korea had conducted a nuclear test 

The launch attempt took place at around 5:20 a.m. Seoul time (2020 GMT)

  North Korea has vowed to conduct more nuclear testing in spite of stepped-up international sanctions

  "Dear comrade Kim Jong Un said work ... must be strengthened to improve nuclear attack capability."

 

  Senior defense officials of South Korea and China will meet in Seoul in an annual forum and discuss a joint...

  "I believe China is aware that if its strong determination is not put into actual, necessary actions, we will not be able...

  "North Korea used heavy video editing to cover over this fact."

  "North Korea will do it to the end until China and the United States want to sign a peace treaty,"...

  The B-52, based in Guam and capable of carrying nuclear weapons, was flanked by two fighter planes, a U.S...