Fortunately for the stability of the world, the difference between the technical-economic potentials of the Soviet Union and the United States is not so great that one of the sides could undertake a "preventive aggression" without an almost inevitable risk of a destructive retaliatory blow. This situation would not be changed by a broadening of the arms race through the development of anti-missile defenses.

Progress, Coexistence and Intellectual Freedom (1968) - Dangers - The Threat of Nuclear War