Deterrence works by denying an easy victory

Preparation for war can protect peace without expressing an appetite for conflict. Economic powers can pursue advantage through trade and diplomatic powers through negotiation, but a state seeking military dominance must be shown that force will not deliver an easy result. A potential aggressor is more likely to negotiate when victory appears costly and, especially, unpredictable. Credible readiness changes an opponent's calculation before fighting begins and gives deterrence its political value.