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Answer 1

In india the Mutual assured destruction or mutually assured destruction (MAD) is a doctrine of military strategy and national security policyin which a full-scale use of nuclear weaponsby 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, which holds that 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, once armed, neither side has any incentive to initiate a conflict or to disarm.