Apr 16, 2013 
Early in the thermonuclear age, Herman Kahn warned the world that it had to “think about the unthinkable”: The consequences of an actual nuclear war, and consider which side – if any – might “win.” While the story may be apocryphal, Kahn is also said to have told Curtis Lemay – then head of the Strategic Air Command – that Lemay did not have a war plan because he focused too heavily on strikes and inflicting maximum damage, while ignoring the consequences of nuclear weapons. Kahn is said to have told Lemay that he lacked a war plan and all he had was a “wargasm.”
The end of the Cold War seemed to put an end to the need for such thinking, but recent developments in North Korea and Iran make it all too clear that there is still a need for such horrifying yet “realist” analysis. Of course, calmer heads may prevail. Reason, deterrence, and arms control may still curtail nuclear proliferation, and are the most probable result of today’s nuclear arms races. But, that probability is declining. Four different nuclear arms races are now interacting to change the need for strategic calculus and demand a strategy that looks beyond arms control and considers a much grimmer future.
India and Pakistan : Suicide with Minor Grand Strategic Consequences
Any war between India and Pakistan would be a pointless human tragedy, and a serious nuclear exchange would bring about the worst possible outcome. Of the current potential nuclear arms races, a nuclear exchange between India and Pakistan risks the most damaging consequences in terms of human deaths, as well as the costs and time necessary to recover.
Ground burst strikes on Indian and Pakistani cities – “countervalue” strikes – would produce extremely high immediate and long-term deaths. Neither country has the medical and security facilities necessary to deal with such casualty burdens; no emergency aid agency is equipped and trained to deal with such events; nor is it clear significant outside aid could come or would come in time to be effective. 
At present, both countries continue to build up their nuclear-armed missile forces and stockpiles of nuclear weapons. While unclassified estimates are very uncertain and differ greatly in detail, an Open Briefing report on Indian nuclear forces drawing on material published in the Bulletin of the Atomic Scientists noted that India continued to improve the nuclear strike capabilities of its combat aircraft and develop sea-based ballistic and cruise missiles, and that its nuclear weapons stocks and missiles could be summarized as follows: 
India is estimated to have produced approximately 520 kilograms of weapons-grade plutonium (IPFM, 2011), sufficient for 100–130 nuclear warheads; however, not all of the material has been converted into warheads. Based on available information about its nuclear-capable delivery vehicles, we estimate that India has produced 80–100 nuclear warheads.
It will need more warheads to arm the new missiles it is currently developing. In addition to the Dhruva plutonium production reactor near Mumbai, India plans to construct a second reactor near Visakhapatnam , on the east coast. India is building an unsafeguarded prototype fast-breeder reactor at the Indira Gandhi Centre for Atomic Research near Kalpakkam (about 1,000 kilometers or 620 miles south of Visakhapatnam), which will significantly increase India’s plutonium production capacity once it becomes operational.
“… India has three types of land-based missiles that may be operational: the short-range Prithvi I, the short-range Agni I, and the medium-range Agni II. The Prithvi I has been deployed for almost 15 years, but the Agni I and II, despite being declared operational, both have reliability issues that have delayed their full operational service.
“India has been busy growing its missile program, with four more Agni versions in progress: an Agni II+ was test-launched in 2010 but failed; the longer-range Agni III, after at least four flight-tests, remains under development; and the Agni IV may be a technology bridge to the newest type, the long-range Agni V, which had its first test-launch in April. Some of these Agni programs may serve as technology-development platforms for longer-range versions.
“The bulk of the Indian ballistic missile force is comprised of three versions of Prithvi missiles, but only one of these versions, the army’s Prithvi I, has a nuclear role. Given its small size (9 meters long and 1 meter in diameter), the Prithvi I is difficult to spot on satellite images, and therefore little is known about its deployment locations. The Prithvi I is a short-range missile (up to 150 kilometers or 93 miles) and is the mainstay of the Strategic Forces Command, India ’s designated nuclear weapons service.
“In December 2011, India successfully test-launched its two-stage Agni I missile, which has a range of 700 kilometers (435 miles), for the eighth time—suggesting that the missile might finally have become fully operational. But a ninth test-launch scheduled for early May 2012 was postponed due to a technical glitch.
The road- or rail-launched Agni II, an improvement on the Agni I, can fly up to 2,000 kilometers (1,243 miles) and can carry a 1,000-kilogram payload, and it takes just 15 minutes for the missile to be readied for firing. The missile has been test-fired eight times with several failures, but more recent test-flights, on May 19, 2010 and September 30, 2011, were successful, demonstrating some progress toward making the Agni II fully operational. A 2010 test-launch of an extended-range Agni II, known as the Agni II+, failed.
“Still under development is India ’s rail-mobile Agni III, a two-stage, solid-fuel missile with a range of more than 3,000 kilometers (1,864 miles)…. India took a significant step forward with the successful test-launch of the Agni V ballistic missile on April 19, 2012. With a range reportedly greater than 5,000 kilometers (3,107 miles), the Agni V can reach any target in China ; however, the missile needs more testing and is still several years away from operational deployment.
A slightly more dated article in the Bulletin of Atomic Scientists describes Pakistan ’s nuclear program as including its F-16 fighters and the following nuclear and missile capabilities:
Pakistan is building two new plutonium production reactors and a new reprocessing facility with which it will be able to fabricate more nuclear weapons fuel. It is also developing new delivery systems. Enhancements to Pakistan ’s nuclear forces include a new nuclear-capable medium-range ballistic missile (MRBM), the development of two new nuclear-capable short-range ballistic missiles, and the development of two new nuclear-capable cruise missiles.
We estimate that Pakistan has a nuclear weapons stockpile of 90–110 nuclear warheads, an increase from the estimated 70–90 warheads in 2009 (Norris and Kristensen, 2009). The US Defense Intelligence Agency projected in 1999 that by 2020 Pakistan would have 60–80 warheads (Defense Intelligence Agency, 1999); Pakistan appears to have reached that level in 2006 or 2007 (Norris and Kristensen, 2007), more than a decade ahead of predictions. In January 2011, our estimate (DeYoung, 2011) of Pakistan’s stockpile was confirmed in the New York Times by “officials and outsiders familiar with the American assessment,” who said that the official US estimate for “deployed weapons” ranged from the mid-90s to more than 110 (Sanger and Schmitt, 2011).1 With four new delivery systems and two plutonium production reactors under development, however, the rate of Pakistan’s stockpile growth may even increase over the next 10 years.
  “The Pakistani government has not defined the number and type of nuclear weapons that its minimum deterrent requires. But Pakistan ’s pace of nuclear modernization—and its development of several short-range delivery systems—indicates that its nuclear posture has entered an important new phase and that a public explanation is overdue.
“…Pakistan has three operational nuclear-capable ballistic missiles: the short-range Ghaznavi (Hatf-3) and Shaheen-1 (Hatf-4) and the medium-range Ghauri (Hatf-5). It has at least three other nuclear-capable ballistic missiles under development: the medium-range Shaheen-2 (Hatf-6), which may soon be operational, and the short-range Abdali (Haft-2) and Nasr (Haft-9) systems.
“… Pakistan is developing two new cruise missiles, the Babur (Hatf-7) and Ra’ad (Hatf-8), and it uses similar language to describe both missiles. According to the ISPR, the Babur and Ra’ad both have “stealth capabilities” and “pinpoint accuracy,” and each is described as “a low-altitude, terrain-hugging missile with high maneuverability”
One has to assume that there should be a high level of rational restraint and deterrence, but both states have a history of overreaction, nationalism, and failure to demonstrate stability and restraint in arms control. More broadly, historical precedent, particularly over the 20th century, does not make a strong case for behavior based on rational bargaining.
It is unclear that either has really thought out the consequences of a nuclear exchange beyond the “Duke Nukem” school of planning: who can kill more of the enemy. Rhetoric asides, the military buildup by both sides suggests a competition aimed at creating the largest possible nuclear “wargasm.”
The bad news is that this ongoing nuclear arms race receives little real attention in terms of what would happen if both sides actually went to war. The good news, from a ruthlessly “realist” viewpoint, is that such a human tragedy does not necessarily have serious grand strategic consequences for other states, and might well have benefits.
Some fallout perhaps, but not that much in terms of serious radiation exposure in terms of exposure measured in rads. The loss of India and Pakistan might create some short term economic issues for importers of goods and services. However, the net effect would shift benefits to other suppliers without any clear problems in substitutions or costs. Some outside aid costs may be incurred, although one has to question whether outside states have any moral obligation to help the truly self-destructive, and how much outside aid could really be useful. In this sense, assistance would be a matter of sentiment rather than imperative.
This is not a reason for outside powers to give up on seeking some form of arms control agreements, confidence building measures, and restraint. It is, however, a cause for Indian and Pakistan strategic analysis to start realistically modeling where they are headed if a nuclear war occurs now, or 5 or 10 years in the future. Unlike conventional weapons, this is not a matter of “toys for the boys.”
It may also be a reason for outside actors like the US and the International Atomic Energy Agency to start assessing these consequences independently, and to force transparency in terms of nuclear stockpiles, delivery capabilities and the results of given types of exchange. It might also be a time for nations, NGOs, and the UN to make it clear there will be no aid to either country in the event a nuclear exchange does occur. These two options, in conjunction with arms control efforts, seem to be the only options where the outside world can really make a difference.
 The Pakistani Wild Cards
If there are wild cards in the India-Pakistani nuclear arms race, they lie in two aspects of the Pakistani nuclear and missile program. First, is the issue of proliferation beyond Pakistan . Pakistan seems to be heading towards over-capacity in nuclear fissile material production and it is developing reliable missiles it can export to third countries that probably do not require a covert presence of the kind China provides in Saudi Arabia .
The end result is the potential to export nuclear armed missiles to a country that Pakistan is convinced would never share nuclear weapons or lose control over them, such as Saudi Arabia . Such a transfer could produce a massive cash transfer and create a new nuclear power opposing Iran – not a serious threat to Pakistan but a regional nuclear rival on its borders.
An abundant stockpile also provides Pakistan the potential to sell nuclear weapons design and test data, as well as missile designs and components. In short, no one can totally decouple Pakistan from future cases of proliferation, nor can one be certain Pakistan would not create new threats through such transfers.
Second, there is the marginal risk that Pakistani nuclear weapons might fall into extremist hands or Pakistan might become an extremist state. Either scenario would leave little hope of rational behavior. Rambo-like fantasies of US Special Forces securing Pakistani nuclear forces aside, these are possibilities that both broaden the scope of possible Pakistani-related nuclear strikes, and significantly decrease the impact of deterrence and restraint in terms of rational bargaining.
The good news is that neither option seems particularly probable in the near term. The bad news is that it is becoming far more difficult to assign such probabilities in the near term, and there is little the US and outside powers can really do to affect the situation.
Preventive strikes do not seem any more credible than the “Rambo” option, threatening retaliation risks triggering further escalation and strikes, and Pakistani nationalism is hostile enough already. Negotiating safety measures, maintaining foreign aid, and pushing for arms control can all have some benefits, but they seem likely to be marginal or useless if internal developments within Pakistan continue to radicalize certain elements.
Iran: Red Lines versus Rhetoric
Iran has already managed to trigger a nuclear arms race without even having a nuclear weapon. Israel long ago extended the range of its nuclear-armed land-based missiles, probably now targets Iran with thermonuclear weapons, and is examining options for sea launched cruise missiles. The US has offered the Gulf states and the region “extended deterrence” – although without specifying whether this would be nuclear or conventional – and is deploying ballistic missile defense ships and selling THAAD, PAC 3, and radars. It is cooperating with Israel in improving the Arrow and shorter-range missile defenses. A credible Saudi voice like Prince Turki has stated that Saudi Arabia is examining nuclear options.
The de facto failure of the latest 5+1 talks with Iran , and the failure of the regime to react to sanctions – at least to date – does not mean that negotiations have failed. Iran has scarcely been forthcoming and has long used negotiations as a cover for continued nuclear programs, but the option of negotiations is still available. Moreover, sanctions are limiting Iran ’s military import, and it can take several years for the damaging and most recent rounds of sanctions to have their most severe political and economic impact. There is also the possibility that the coming Iranian election may signal that Iran is willing to accept some level of “reform” and added compromise; although it is just as likely that elections signal the opposite—that the Supreme Leader is in total control and will tolerate no real challenge.
At the same time, Iran’s red lines have shifted to the point where they now are at the nuclear breakout and IRBM stage of development, and where Iran can now move towards the following new red lines: fissile grade enrichment, “cold” or passive nuclear weapons testing, creation of new dispersed or sheltered facilities with more advance centrifuges, testing an actual nuclear device, and arming its missiles with an untested nuclear warhead – a risk that sounds extreme until one remembers the reliability and accuracy of US nuclear-armed systems like Jupiter and the M-4/MGM-18 LaCrosse.
There is no reliable way to predict such events in advance. They are only likely to become “red lines” when they are actually crossed and have been detected. There also is no unclassified way to know how much design and test data Iran has received from the outside, and how well it can hide its efforts and leap frog to some form of weapons deployment.
Equally important, there is no way to know exactly how the US would react and how much international support it would get. Gulf leaders, for example, talk privately about such support but are remarkably silent when the subject of supporting and basing US preventive strikes is raised in any open forum that even hints at public commitment.
Moreover, there is no way to know how Israel would react. At this point, its nuclear efforts are so tightly concealed that there is no public debate over its nuclear weapons holding, missile forces, and possible addition of sea or air-launched systems. The US has made it clear that it does not want Israeli preventive strikes, but has never publically said it would ride out any Israel effort and let Israel take the consequences.
Israel may or may not be able to hit at all of Iran ’s current major publically known nuclear enrichment facilities. The hardening of Natanz and Fordow raise questions for a force of fighter-bombers using conventional earth penetrators (although nuclear-armed penetrators would be a very different story).
As for the US , it has steadily refined its military strike options and kept them very real. The US can hit at the full mix of suspect sites – including research and centrifuge production, take out much of Iran ’s defenses and missile capabilities, and has access to Gulf bases. And it can restrike if Iran tries to recreate its facilities. These are all capabilities Israel probably lacks -- although several factors may have eased its may have eased its penetration and refueling problems, including Israel’s quasi-rapprochement with Turkey, Syria’s civil war, and Iraq’s problems in getting advanced fighters and weapons from the US.
 The US has also said that an Iranian nuclear force is “unacceptable.” Like the word “no,” however, “unacceptable” is far more difficult to define in practice than in the dictionary. Preventive strikes by either the US or Israel can trigger a far more intensive Iranian nuclear effort, withdrawal from the NNPT with claim the act is “defensive,” and a wide range of low level military acts in the Gulf or effort to use proxies and surrogates in Lebanon, Iraq, and the Gaza. Sustaining even a major US strike requires sustain support from the Arab Gulf states for restrikes, as well as willingness to counter Iranian asymmetric and even missile strikes.
 US rhetoric about refusing to rely on “containment” is inherently absurd since the US would have to rely on containment after preventive strikes and has no credible options to invade Iran or force Iranian regime change on its own. The question then arises as to whether the US can create a serious form of the “extended deterrence”, which Secretary Clinton offered the Arab Gulf states and region, with or without preventive strikes since any reliance on missile defense alone would be credible or sufficient. It is whether the US meant nuclear or just precision conventional “extended deterrence,” and how that guarantee would evolve if Iran deployed nuclear armed missiles and forces.
 In balance, bad as the risks and uncertainties are, the US might have to carry out preventive strikes if Iran crossed two of the potential red lines listed earlier: testing an actual nuclear device, and arming its missiles with an untested nuclear warhead. The other options: fissile grade enrichment, “cold” or passive nuclear weapons testing, and creation of new dispersed or sheltered facilities with more advance centrifuges, are now too close to what has already happened and would present massive problems in terms of US credibility given the US false alarms in Iraq. The US cannot afford to be seen as over-reacting and neither can its allies.
 At the same time, the US cannot underreact as well. If some argue that Iran should learn from Libya , the US should definitely learn from North Korea . Brazil , South Africa and Argentina are not the models for dealing with Iran . Once Iran has become an active military power, it is likely to move forward toward more and more nuclear weapons, boosted and thermonuclear weapons designs, and combinations of launch on warning, launch under attack and then dispersed and shelter forces.
Pressure from Israel, Saudi (and possibly Turkish) nuclear and missile forces will add to the resulting arms race, as will the US need to constantly upgrade any forces for “extended deterrence.” 
 The most “quiet” or discrete extended deterrence option would be nuclear armed, submarine or surface launched cruise missiles backed with the deployment of conventionally armed cruise or ballistic missiles with terminal guidance systems capable of point attacks on Iran’s most valuable civil and military assets.
 The most decisive extended deterrence options would be the equivalent of the combination of Pershing II and GLCMs that were land based, had US operating crews both deep inside the Arab Gulf and other regional states and in or near key major cities, and had both nuclear and precision conventional warheads. Iran would be faced with the inability to strike at key Arab population centers without striking at US forces and still see mobile US nuclear armed forces in reserve. It also could not use conventional warheads without facing a more accurate and reliable US strike force in return.
 The US could work with key Arab allies and the GCC to create the same kind of layered defenses against missiles and rockets being developed in Israel, and – as is suggested later -- use the South Korean model to help create layered defenses in the gulf, allowing an indirect form of cooperation between Israel and the Gulf states without overt ties or relations.
 As is the case with India and Pakistan , it also is important to think the unthinkable in terms of what a nuclear war in the region might become. Even today, it is possible to think of some Iranian covert nuclear attack on Israel or a Gulf state using a gun device hidden in a ship – or less credibly – given to a proxy like the Hezbollah. The end result of an attack on Israel might well be nuclear ground bursts on Iranian cities – a far great “existential threat” to Iran than the kind of attack Iran could launch again Israel during the first years of its nuclear forces. And, the situation is scarcely likely to get better as all of the current and potential nuclear powers affecting the nuclear balance steadily increase their capabilities over the years and decades ahead.
 Israel would have no reason to limit the scale of its retaliation, and outside states would have no strategic reason to urge such restraint. The outside world may need Iranian oil – although that is now questionable given developments in shale oil and gas and other sources of energy and liquid fuels. No one needs Iranians and no one needs an Iranian regime with any chance of recovering nuclear capability.
 Horrible as a nuclear exchange of any kind could be in humanitarian terms, the grim logic of strategic realism does not place any restraints on Israeli retaliatory attacks on Iran . As for Saudi Arabia and extended deterrence, the US has to consider the tradeoff between all of the risks and costs of preventive strikes and the costs and risks of nuclear exchanges or the use of extended deterrence if the US does not act.
Arms control negotiations, sanctions, clearly defined redlines and public analysis of the cost to Iran of a nuclear exchange are all interim steps that might eliminate the need for preventive strikes, but some red lines are deadlines and make it time to act.