"Nuclear doctrine consists of thinking the unthinkable. It involves making threats and promising retaliation that is cruel and destructive beyond imagining. But it has its purpose: to prevent war in the first place.
During the Cold War, we let the Russians know that if they dared use their huge conventional military advantage and invaded Western Europe, they risked massive U.S. nuclear retaliation. Goodbye, Moscow.
Was this credible? Would we have done it? Who knows? No one's ever been there. No one's ever had to make such decisions. A nuclear posture is just that — a declaratory policy designed to make the other guy think twice.
Our policies did. The result was called deterrence. For half a century, it held. The Soviets never invaded. We never used nukes. That's why nuclear doctrine is important."
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