U.S. President Barack Obama’s commitment to preventing and rolling back the spread of nuclear weapons was clear from the first days of his administration, when he pledged in Prague in April 2009 “to seek the peace and security of a world without nuclear weapons.” The historic vow shattered precedent, seized international attention and helped him win the Nobel Peace Prize later that year. Yet as he prepares to leave office seven years later, it appears that with the exception of a fledgling nuclear deal with Iran, Obama will leave an arms control legacy that is arguably little better than that […]