U.S. President Jimmy Carter, left, and Soviet President Leonid Brezhnev smile and shake hands while Soviet Foreign Minister Andrei Gromyko, center, applauds in the Vienna Imperial Hofburg Palace after Carter and Brezhnev signed the SALT II treaty, in this June 18, 1979 photo. Referring to U.S.-Soviet relations, Carter once lamented "our two countries do not naturally truyst one another." (AP Photo)