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    Home » In-depth » How a successful US missile intercept ended the era of nuclear stability

    How a successful US missile intercept ended the era of nuclear stability

    By Agency Staff30 November 2020
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    This month, an intercontinental ballistic missile was fired in the general direction of the Hawaiian islands. During its descent a few minutes later, still outside the Earth’s atmosphere, it was struck by another missile that destroyed it.

    With that detonation, the world’s tenuous nuclear balance suddenly threatened to come out of kilter. The danger of atom bombs being used again was already increasing. Now it’s grown once more.

    The ICBM flying over the Pacific was an American dummy designed to test a new kind of interceptor technology. As it flew, satellites spotted it and alerted an Air Force base in Colorado, which in turn communicated with a Navy destroyer positioned northeast of Hawaii. This ship, the USS John Finn, fired its own missile which, in the jargon, hit and killed the incoming one.

    The coming era of questionable deterrence and asymmetric vulnerabilities will be less stable and therefore even more frightening

    At first glimpse, this sort of technological wizardry would seem to be a cause for not only awe but also joy, for it promises to protect the US from missile attacks by North Korea, for example. But in the weird logic of nuclear strategy, a breakthrough intended to make us safer could end up making us less safe.

    That’s because the new interception technology cuts the link between offence and defence that underlies all calculations about nuclear scenarios. Since the Cold War, stability — and thus peace — has been preserved through the macabre reality of mutual assured destruction, or MAD. No nation will launch a first strike if it expects immediate retaliation in kind. A different way of describing MAD is mutual vulnerability.

    Gone

    If one player in this game-theory scenario suddenly gets a shield (these American systems are in fact called Aegis), this mutual vulnerability is gone. Adversaries, in this case mainly Russia but increasingly China, too, must assume that their own deterrent is no longer effective because they may not be able to successfully strike back.

    For this reason, defensive escalation has become almost as controversial as the offensive kind. Russia has been railing against land-based American interceptor systems in places like Eastern Europe and Alaska. But this month’s test was the first in which a ship did the intercepting. This twist means that before long, the US or another nation could protect itself from all sides.

    This new uncertainty complicates a situation that was already becoming fiendishly intricate. The US and Russia, which have about 90% of the world’s nukes, have ditched two arms-control treaties in as many decades. The only one remaining, called New Start, is due to expire on 5 February, a mere 16 days after Joe Biden takes office as president. The Nuclear Non-Proliferation Treaty, which has for 50 years tried to keep nations without nukes from acquiring them, is also in deep trouble, and due to be renegotiated next year. Iran’s intentions remain unknown.

    US President-elect Joe Biden. Image: Gage Skidmore

    At the same time, both the US and Russia are modernising their arsenals, while China is adding to its own as fast as it can. Among the new weapons are nukes carried by hypersonic missiles, which are so fast that the leaders of the target nation only have minutes to decide what’s incoming and how to respond. They also include so-called tactical nukes, with “smaller” (in a very relative sense) payloads that make them more suitable for conventional wars, thus lowering the threshold for their use.

    The risk thus keeps rising that a nuclear war starts by accident, miscalculation or false alarm, especially when factoring in scenarios that involve terrorism, rogue states or conflicts in outer space or cyberspace. In a sort of global protest against this insanity, 84 countries without nukes have signed a Treaty on the Prohibition of Nuclear Weapons, which will take effect next year. But neither the nine nuclear nations nor their closest allies will ever sign it.

    Instead, the existing nuclear powers will interpret news of successful interceptor tests as an impetus for a new arms race. They will make even faster missiles with more decoys and countermeasures, new warheads for more flexible uses in a greater variety of strategic scenarios, and of course their own shields.

    This must stop. And the best-placed world leader to take the initiative in halting the madness is the incoming US president

    This must stop. And the best-placed world leader to take the initiative in halting the madness is the incoming US president. Upon taking office, Biden should immediately propose that the US and Russia roll over New Start for another five years to buy time. He should simultaneously invite China and the other nuclear powers to the table.

    The first goal should be a declaration by all nine that their nukes have the sole purpose of deterrence and will never be used aggressively. They should also give new assurances of security and help to non-nuclear nations, and create new communications protocols for crises. And yes, they must now agree to limit and monitor not only each other’s offensive weapons but also their defences.

    The era of MAD and mutual vulnerability was terrifying but in a surreal way also stable. The coming era of questionable deterrence and asymmetric vulnerabilities will be less stable and therefore even more frightening. Biden will have much in his inbox come January. He better make sure arms control isn’t at the bottom.  — By Andreas Kluth, (c) 2020 Bloomberg LP



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