This undated file photo provided Tuesday, Sept. 19, 2017, by Russian Defense Ministry official web site shows a Russian Iskander-K missile launched during a military exercise at a training ground at the Luzhsky Range, near St. Petersburg, Russia. A landmark arms control treaty that President Ronald Reagan and Soviet leader Mikhail Gorbachev signed three decades ago is dead. The U.S. and Russia both walked away from the deal on Friday, Aug. 2, 2019. (Russian Defense Ministry Press Service via AP/File)
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