In February, 2005 the arms race in Asia turned another corner when North Korea publicly acknowledged it had available one or more nuclear weapons. U.S. military strategy and arms control policy both emphasize the containment of the spread of weapons of mass destruction (WMD). The most dangerous WMD are the nuclear ones, and a nuclear arms race is now under way in Asia. Although policy makers and others concerned about nuclear weapons spread can continue to hope for the best, it is time to begin thinking seriously about the worst.