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(CNN) 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. That is, of course, a rapidly developing situation. A North Korean official threatened this week that his country would test a hydrogen bomb over the Pacific Ocean after President Donald Trump  called North Korean leader Kim Jong Un "rocket man" and the North Korean shot back that Trump was a "dotard ." The road to North Korea's weapons capability follows decades of ups and downs as nuclear states such as the United States and Russia have built up and dismantled their programs. Today, Russia is believed to have the most nuclear weapons, with 4,300. Not far behind is the United States, with 4,000, according to  The Bulletin of the Atomic Scientists' Nuclear Notebook . Of the world's approximately 15,000 nu...

North Korea said on Sunday it exploded a nuclear bomb, conceivably setting off a manufactured quake and provoking prompt judgment from its neighbors – notwithstanding the maverick administration calling the test an “impeccable achievement.” The impact, completed at 12:29 p.m. nearby time at the Punggye-ri site, set off an extent 6.3 tremor in North Korea, the U.S. Topographical Survey announced, however authorities in Seoul said it was a greatness 5.7 tremor.