South Korea said it would accelerate the development of longer-range ballistic missiles that could cover the whole of North Korea in response to a third nuclear test by Pyongyang.
In October last year, South Korea reached a deal with the United States to almost triple the range of its missile systems -- with Seoul arguing it needed an upgrade to counter the North's missile and nuclear programmes.
The United States has 28 thousand 500 troops in South Korea and guarantees a nuclear "umbrella" in case of any atomic attack. In return, Seoul accepts limits on its missile capabilities.
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