"Of course political and military sanctions need to be stepped up, but civilian opening up and exchanges must be strengthened too....

 

  The United States said it would work with partners to impose new sanctions, and called on China to use...

 

 

  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 South's military said the missiles were medium-range Rodong-class

It is seen as several years away from building an intercontinental ballistic missile (ICBM) that can carry a nuclear warhead  

  Japan said the missile reached its air defense identification zone (ADIZ), the first time by a North Korean missile.

  "That missile works."

  No one on board was injured

  Park said North Korea could stage an act of aggression at any time, including possibly a fifth nuclear test or cyber...

  Kim Jong Un supervised the exercise that successfully tested the simulated detonation of nuclear warheads mounted on missiles, KCNA news...