btw MAD means Mutual assured destruction
it is a doctrine of military strategy and national security policy in which a full-scale use of high-yield weapons of mass destruction by two or more opposing sides would cause the complete annihilation of both the attacker and the defender (see Pre-emptive nuclear strike and Second strike).[1] It is based on the theory of deterrence where the threat of using strong weapons against the enemy prevents the enemy's use of those same weapons. The strategy is a form of Nash equilibrium in which neither side, once armed, has any incentive to initiate a conflict or to disarm.
