A Russian intercontinental ballistic missile is moved during military training in the mid-1990s near Irkutsk, Siberia, Russia. Arms control has been at the center of a decades-long discussion between Russia and the U.S.
President Obama speaks beside Russian President Dmitry Medvedev after signing New START documents in 2010. Now five years old, that treaty has taken on renewed relevance in light of the framework nuclear deal between the U.S. and Iran.
Joe Klamar/AFP/Getty Images