On Defense by Nuclear Deterrence

War winning, however, is impossible precisely because of the fact that there is no defense now against all-out nuclear use and probably not for the foreseeable future. A nuclear war could therefore be controlled and won only if one side consciously chose to lose the war, an event as unlikely in the future as it has been rare or nonexistent in the past. It is not necessary to win a nuclear war in order to deter it; one has only to ensure that both are likely to lose it.