In this Saturday, Oct. 10, 2015, photo, a ballistic missile is paraded in Pyongyang, North Korea during the 70th anniversary celebrations of its ruling party's creation. Pyongyang has long claimed it has the right to develop nuclear weapons to defend itself against the U.S., an established nuclear power with whom it has been in a state of war for more than 65 years. But to build a credible nuclear threat, the North must explode new nuclear devices including miniaturized ones so its scientists can improve their designs and technology. (AP Photo/Wong Maye-E)
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