(Russian Defense Ministry Press Service via AP ) This undated photo provided Sept. 19, 2017, by Russian Defense Ministry official website 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.