“…foreign policy of a pluralistic democracy like the United States should be based on bipartisanship because bipartisanship is the means and the framework for formulating policies based on moderation and on the recognition of the complexity of the human condition. That has been the tradition since the days of Truman and Vandenberg all the way until recent times.”

1980s, First term of office (1981–1985), Address on the Strategic Defense Initiative (1983)
Context: The defense policy of the United States is based on a simple premise: The United States does not start fights. We will never be an aggressor. We maintain our strength in order to deter and defend against aggression — to preserve freedom and peace.
Since the dawn of the atomic age, we have sought to reduce the risk of war by maintaining a strong deterrent and by seeking genuine arms control. Deterrence means simply this: Making sure any adversary who thinks about attacking the United States or our allies or our vital interests concludes that the risks to him outweigh any potential gains. Once he understands that, he won't attack. We maintain the peace through our strength; weakness only invites aggression.
This strategy of deterrence has not changed. It still works. But what it takes to maintain deterrence has changed. It took one kind of military force to deter an attack when we had far more nuclear weapons than any other power; it takes another kind now that the Soviets, for example, have enough accurate and powerful nuclear weapons to destroy virtually all of our missiles on the ground. Now this is not to say that the Soviet Union is planning to make war on us. Nor do I believe a war is inevitable — quite the contrary. But what must be recognized is that our security is based on being prepared to meet all threats.
There was a time when we depended on coastal forts and artillery batteries because, with the weaponry of that day, any attack would have had to come by sea. Well, this is a different world and our defenses must be based on recognition and awareness of the weaponry possessed by other nations in the nuclear age.
We can't afford to believe that we will never be threatened. There have been two world wars in my lifetime. We didn't start them and, indeed, did everything we could to avoid being drawn into them. But we were ill-prepared for both — had we been better prepared, peace might have been preserved.
The Soviet Buildup For 20 years, the Soviet Union has been accumulating enormous military might. They didn't stop when their forces exceeded all requirements of a legitimate defensive capability. And they haven't stopped now.