Nuclear disarmament is at a critical juncture. New START has bound the United States and Russia to lower their levels of nuclear arms while remaining committed to further nuclear reductions. New START implementation is on track, but the next round of U.S.-Russian reductions is not yet on the horizon. Serious political and military obstacles impede progress. President Obama has off ered to mutually reduce deployed strategic warheads by one-third below New START levels, but significant skepticism resides in the U.S. Congress. Moreover, Moscow has shown little enthusiasm for further reductions. The current political impasse threatens future progress toward realizing the vision of a world free from nuclear weapons. In 2015, NPT non-nuclear-weapon states will most likely cite with increased urgency the disarmament obligations of the nuclear-weapon states.