You have started a war you cannot end. The Soviets move on West Berlin, and direct fighting ensues in Cuba and Germany. Before long the conflict escalates into full nuclear war and destroys human society as we know it. Stubbornness is not a good quality when nuclear weapons are aimed all around the world. One can only hope that the utter destruction of most of the United States and the Soviet Union and much of the rest of the world, in addition to the impending nuclear winter, will drive humankind to seek some sort of lasting peace in the few remaining habitable areas.