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

North Korea suspected to have conducted fifth nuclear test

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

North Korea makes progress on missiles, but no evidence of nuclear weapons yet

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

Hinkley Point nuclear project said China believes Britain will continue to have an open policy towards China

An appeal may take about a year and means continued extra purchases of oil, gas or coal to replace nuclear power...

China is seen as leading opposition to the U.S. move to include India in the 48-nation Nuclear Suppliers Group ...

“Everything in North Korea is a cause for concern,” a U.S. official said

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