Nine nuclear-capable states exist in the world, but only eight of them -- all but North Korea -- are believed by experts to have weapons mature and developed enough to be readily incorporated into the arsenals of their armed forces.
Seismic activity was detected Saturday near the site of North Korea's Punggye-ri nuclear site, but it is not known whether a nuclear test caused the development. The first sign Pyongyang has conducted a nuclear test is usually seismic activity.
Four days after President Donald Trump unleashed a torrent of abuse directed toward North Korea and Iran from the rostrum of the United Nations, those country's leaders are firing back -- a response in kind that only threatens to escalate dueling nuclear standoffs.
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