Kim Jong UN warns he will marshal full nuclear force if Pyongyang is threatened as never-before-seen weapons unveiled at event marking 75 years in power for ruling party

North Korean leader's younger sister Kim Yo Jong seen as the most likely candidate to succeed her brother, but collective leadership also seen as possibility

Satellite image reportedly shows Pyongyang preparing to resume testing engines at launch facility partially dismantled in denuclearization agreement

Move by Pyongyang latest to put question mark over resumption of denuclearization talks with US