The 'Dear Leader' or his propagandists make another claim of nuclear advancement by a country that makes 3rd world seem advanced. The man loves to "cry wolf". If the north is this advanced, why do they have one of the least reliable electrical systems in the world?

The successful nuclear fusion marks a great event that demonstrated the rapidly developing cutting-edge science and technology of the DPRK [Democratic People's Republic of Korea]," wrote Rodong Sinmun, the newspaper of the ruling communist party, as quoted by Agence France-Presse. The Rodong Sinmun said the North's experts had worked hard to develop the "safe and environment-friendly new energy" technology.
The North said the achievement was made to mark the Day of the Sun -- the anniversary on April 15 of the birth of founding president Kim Il-Sung.
North Korea claims successful nuclear fusion test - CSMonitor.com

AFP: N.Korea boasts success in nuclear fusion