North Korea's Kim Jong Un announces new nuclear plans and purges officials

North Korean leader Kim Jong Un has announced the country will soon unveil new, 'next-stage' plans for its nuclear deterrent. He also warned of 'excruciating mental agony' for his enemies.

At the same time, Kim has been purging senior officials, dismissing a vice premier over a factory project and firing others he called 'incompetent'. He also oversaw a hypersonic missile test and his sister, Kim Yo-jong, demanded an explanation from South Korea over an alleged drone incursion.