Hydrogen bomb testing

North Korea nuclear tests: US and China to co-operate

China and the United States will work together to try and prevent further missile tests by North Korea, US President Barack Obama says.

N Korea warns of strike on Seoul's presidential palace

North Korea warns that its military is ready to attack Seoul's presidential palace unless South Korean President Park Geun-hye apologizes for "treason" and publicly executes officials responsible for what Pyongyang says are plans to attack its leadership.

North Korea fires five short-range missiles into sea

North Korea fires five short-range missiles into the sea off its east coast -- the latest in a series of launches ordered by leader Kim Jong-Un amid rising military tensions.

'Artificial earthquake' detected in North Korea

A small artificial earthquake has been detected in North Korea, according to South Korean officials who say it was probably due to "blasting work".

US submits tougher sanctions on N Korea

The US, backed by China, submits a draft resolution to the UN Security Council aimed at imposing tougher sanctions on North Korea.

N-Korea announces ‘successful’ hydrogen bomb test

The North Korean authorities say they have successfully tested a hydrogen bomb amid reports of a tremor near the main nuclear test site.