| Nuclear weapons |
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| Background |
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Innuclear strategy, aretaliatory strike orsecond-strike capability is a country's assured ability to respond to a nuclear attack with powerful nuclear retaliation against the attacker.[1] To have such an ability (and to convince an opponent of its viability) is considered vital innuclear deterrence, as otherwise the other side might attempt to try to win anuclear war in one massivefirst strike against its opponent's own nuclear forces.
The possession of second-strike capabilities counters a first-strike nuclear threat and can support ano first use nuclear strategy. Reciprocal second-strike capabilities usually cause amutual assured destruction defence strategy, though one side may have a lower levelminimal deterrence response.
Second-strike capabilities can be further strengthened by implementingfail-deadly mechanisms. These mechanisms create a threshold and guaranteed consequences if that threshold is breached. For instance, a threshold may be for an allied nation not to be attacked. If a rival nation then breaches this threshold by attacking the allied nation, then the predetermined consequences for this action go into effect. These predetermined consequences could include a wide range of responses, including a retaliatory nuclear second strike.
The crucial goal in maintaining second-strike capabilities is preventing first-strike attacks from taking out a nation's nuclear arsenal. In this manner, a country can carry out nuclear retaliation even after absorbing a nuclear attack. The United States and other countries have diversified their nuclear arsenals through thenuclear triad in order to better ensure second-strike capability.[2]
Submarine-launched ballistic missiles are the traditional, but very expensive, method of providing a second strike capability, though they need to be supported by a reliable method of identifying who the attacker is. Using SLBMs as a second-strike capability has a serious problem, because in retaliation for a submarine-launchedICBM, the wrong country could be targeted, and can cause a conflict to escalate. However, implementation of second strikes is crucial to deter a first strike. Countries with nuclear weapons make it their primary purpose to convince their opponents that a first strike is not worth facing a second strike. Such countries have many diverse launch mechanisms, prepared responses to various nuclear attack scenarios, launch mechanisms in many different areas of the country, and underground launch facilities that are specifically designed to withstand a nuclear attack.[citation needed]
Launch on warning is a strategy of nuclear weapon retaliation that gained recognition during theCold War between theWestern Bloc and theEastern Bloc.In addition to the nuclear triad, nations deploy an early warning system that detects incoming nuclear missiles. This gives that nation the capability and option to launch a retaliatory second strike before the incoming nuclear first strike hits any of its targets. This is another method of solidifying second-strike capabilities and deterring a first strike from another nuclear power.[3]
Because of the low accuracy (circular error probable) of early-generationintercontinental ballistic missiles (and especially submarine-launched ballistic missiles), second strike was initially only possible against very large, undefendedcountervalue targets like cities. Later-generation missiles with much improved accuracy made second-strikecounterforce attacks against the opponent's hardened military facilities possible.[citation needed]
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Perimetr-PTS, otherwise known as "мёртвая рука" (the Dead Hand) within Russia, is a Russian nuclear deterrence developed to automatically launch ballistic missiles as a retaliatory attack in the event that the Russian command and control system is destroyed in a surprisedecapitation strike.
Perimetr PTS dates back to 1974, in response to Soviet fears of devastating nuclear strikes from US ballistic missile submarines. It became operational in January 1985, with SS-17 launch silos in Vypolzovo (Yedrovo) and Kostroma, each 100 and 150 miles north-west of Moscow respectively. The system was built with multiple layers of redundancy, in case multiple layers of communications were destroyed in the initial strike. Launch authorization would be transmitted by UHF radio, by transmitters buried deep underground. Development continued over the years with the system incorporating the newRT-2PM2 Topol-M ICBMs in December 1990, and further refinements in 1996.
Russian leadership was concerned that the system could trigger an accidental launch, so they incorporated numerous safeguards into its design.
Despite the automated launch capabilities, Russian nuclear command and control could order missiles to self-destruct mid-flight in the event of an accidental launch.[citation needed] Russian ballistic missile submarines were reportedly never incorporated into Perimetr-PTS, given the inherent communication issues which could ensue.
As early as 1940, science fiction writerRobert A. Heinlein wrote thescience fictionshort storySolution Unsatisfactory in which he described a nuclear arms race between theUnited States and theSoviet Union. In one episode, the US cabinet discusses the scenario of a Soviet surprise attack in which American cities would be destroyed, but the US armed forces would survive and launch a counter-attack.