by Sebastien Berger Agence France Presse SEOUL, South Korea — North Korea said it detonated a hydrogen bomb designed for a long-range missile on Sunday and called its sixth and most powerful nuclear test a “perfect success,” sparking world condemnation and promises of tougher United States sanctions. Pyongyang residents threw their arms aloft in triumph as a jubilant television newsreader hailed the “unprecedentedly large” blast. It “marked a very significant occasion in attaining the final goal of […]