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FILE - In this May 30, 2013 file photo, U.S. and South Korean Army soldiers cross Nam Han river during a joint military exercise between the U.S. and South Korea in Yeoncheon near the border with North Korea, in South Korea. North Korea’s propaganda machine is churning out near-daily diatribes against the United States and South Korea for a series of soon-to-start military maneuvers, warning nuclear war could be imminent and saying it will take dramatic action of its own if further provoked. (AP Photo/Ahn Young-joon, File)

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