Pyongyang admitted for the first time that it has sent troops to fight against Ukraine, according to North Korean media.

North Korea's involvement in the war has sparked fears of global escalation, with Seoul especially concerned of Pyongyang's troops gaining experience.

Bella Seo, who fled North Korea when she was a teenager, has given a chilling account of what school life is like in the hermit kingdom, where children are forced to do hard labour.