President Obama has put nonproliferation policy at the center of his vision of American security – and made significant advances to reduce the threat from nuclear weapons. Yesterday at the UN General Assembly, Obama not only pledged American leadership in the effort to strengthen international nonproliferation treaties, but gained Russian and Chinese support as well. Today, a meeting of the UN Security Council convened and chaired by Obama agreed to take significant steps to tackle the threat. These efforts directly relate to preventing rogue states like Iran and North Korea from developing nuclear weapons. And on this front, President Obama was able to gain Russian support for a unified international response if talks fail with Iran. The U.S. has embraced a path that meets the nuclear threat with tough negotiations, strong safeguards, and an approach that builds on the strengths of other nations, rather than excluding them.