Generate text that refutes this claim: A robust missile defense shield will provide the protection previously afforded by the doctrine of Mutually Assured Destruction, allowing the US to dismantle much of its dangerous nuclear arsenal  With a fully functioning missile defense shield deployed, nuclear-armed ballistic missiles become obsolete, unable to ever reach their targets. This means countries’ strategic obsession with second-strike capacity, the ability to return fire with nuclear weapons should they be attacked by them (Mutually Assured Destruction), will cease to be an issue, as first-strikes are destined to be wiped out before they hit a single target. What this means is that countries with missile defense systems can feel secure without the need of retaining massive nuclear arsenals. This will alleviate the pressure to have stockpiles of warheads and will promote disarmament. Mutually Assured Destruction has become a far less secure strategy as nuclear proliferation has occurred to states with different strategic conceptions. This has been seen in the United States, which since its full adoption of the Aegis system has actively pursued a policy of reaching a new accord with Russia on nuclear arms reduction. This culminated in 2010 with the signing of the New START (Strategic Arms Reduction Treaty), an accord to reduce the number of strategic nuclear missile launchers by half (Associated Press, 2011). This new step toward nuclear disarmament could not be politically possible in the United States without a replacement defense, which only a national missile defense system can provide.
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Nuclear capability has historically created more stable international relations between countries, as described in the doctrine of Mutually Assured Destruction (MAD). The United States and Russia never engaged one another in open conflict during the whole span of the Cold War, for example, for fear of setting off a nuclear cataclysm neither could survive (Waltz, 1981). MAD breaks down, however, with the advent of national missile defense systems. This is due to the fact that when a state cannot guarantee its second-strike, or even first-strike capability it becomes vulnerable. Countries without missile defense systems will be defenseless against those that have them. Furthermore, as the technology is disseminated and more countries possess missile defense systems, stability decreases as it will become a gamble as to which country can more successfully counteract the offensive and defensive missile systems of the enemy. Missile defense makes the world less, not more safe.