North Korean leader Kim Jong Un has pledged to irreversibly cement his country’s status as a nuclear power while maintaining a hard-line stance toward South Korea, which he called the “most hostile” state. SEOUL, South Korea (AP) — North Korean leader Kim Jong Un has pledged to irreversibly cement his country’s status as a nuclear power while maintaining a hard-line stance toward South Korea, which he called the “most hostile” state, state media said T... [3070 chars]