North Korea conducted its third nuclear test Tuesday, the latest step in a years-long effort to develop nuclear weapons. Experts believe the country remains far from having a nuclear-armed missile that could threaten the United States, which would require an accurate long-range rocket and a nuclear warhead that could be mounted on it.
Here is a look at North Korea’s progress so far:
• Rocket launch (August): This early launch gets the world’s attention because it goes well beyond North Korea’s known capability. The rocket, which hurtles over Japan, has an estimated potential range of 1,550 miles, but accuracy reportedly is poor, with no meaningful strike capability.
• Nuclear test (October): North Korea detonates a nuclear device for the first time, but the yield is a very low 0.5 to 1 kiloton.
• Rocket launch (April): This launch is a partial success, with two of the three stages pushing the rocket out over the Pacific Ocean. The third stage fails, and despite North Korea’s claims of success, no satellite is put into orbit, the U.S. says. The rocket, dubbed Unha-2, represents a significant advancement over previous rockets, according to experts.
• Nuclear test (May): The second detonation of a nuclear device is a partial success, with a larger yield of 2 to 6 kilotons, but still below the 10 kilotons that experts consider a successful blast.
• Rocket launch (April 2012): The launch of Unha-3 rocket, with a potential range of 6,200 miles, ends in embarrassing failure as the rocket splinters into pieces over the Yellow Sea soon after takeoff. Hours later, the country acknowledges the satellite failed to enter orbit in an announcement on state TV.
• Rocket launch (December 2012): This time, the rocket succeeds in launching a satellite into space. Its range, though questioned by some experts, in theory puts the U.S. West Coast, Hawaii, Australia and Eastern Europe within striking distance.
• Nuclear test (February 2013): North Korea says it has detonated a miniaturized nuclear device. If true, this would be an advance, as North Korea needs to master the technology to make a nuclear device small enough to mount on a missile. Early estimates put the yield at 6 to 7 kilotons, but that has yet to be confirmed.
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