Over the long course of the nuclear age, millions of people—from Hiroshima and Nagasaki to the United States, Russia, and around the globe—have stood up to demand meaningful action to halt arms racing, end nuclear weapons testing, reduce the number and role of nuclear weapons, and move toward the elimination of nuclear weapons. But without renewed public pressure and focused international demands for renewed disarmament diplomacy between Washington and Moscow, a dangerous, unconstrained global nuclear arms race is on the horizon. Already unsteady and dangerous relations between Moscow and...