The aggressor too should know that the preemptive use of nuclear weapons would not insure victory. With modern detection systems and the combat readiness of the Soviet Union's strategic nuclear forces, the United States would not be able to deal a crippling blow to the socialist countries. The aggressor will not be able to evade an all-crushing retaliatory strike.
Quoted in "Physics and Nuclear Arms Today" - Page 94 - by David Hafemeister - Science