Newsclick talks to Prabir Purkayastha on the latest developments in North Korea. The nation claims that it has successfully tested hydrogen bomb, marking sixth nuclear test since 2006. According to Prabir, hydrogen bomb is a game changer because it has two elements to it. One is the ability to have a bigger explosion and the second, the ability to inflict larger damage. Any attack by one bomb would mean a blanket attack by the other side.