SEOUL, South Korea — North Korea is capable of detonating another nuclear device anytime at one of its unused tunnels at the country's main atomic test site, Seoul official said Monday, three days after the country carried out its fifth bomb explosion.
The North's latest nuclear test was the most powerful to date and its claim to have used "standardized" warheads sparked worries it was making headway in its push to develop small and sophisticated warheads to be topped on missiles. Seoul, Washington and their allies subsequently vowed to apply more...
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