FILE - In this July 4, 2017, file photo, a U.S. missile defense system called Terminal High Altitude Area Defense, or THAAD, is seen at a golf course in Seongju, South Korea. North Korea claims it is in the final stages of preparing a plan to launch four intermediate-range ballistic missiles over Japan and into waters just off the island of Guam, where about 7,000 U.S. troops are based. The U.S. has pumped billions of dollars into its missile defense systems and sold hundreds of millions of dollars' worth to its allies, including the very controversial deployment of a state-of-the-art system known by its acronym, THAAD, in South Korea. (Kim Jun-beom/Yonhap via AP, File)
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