There is a paradox at the heart of nuclear weapons theory, and Pakistan has built an entire doctrine on top of it. The theory says: more nuclear weapons means more deterrence means more stability. The evidence from South Asia says something more disturbing — that when nuclear weapons multiply, diversify, and shrink to battlefield scale, the line between "deterrence" and "use" begins to blur in ways that make the weapons themselves more dangerous, not less.
Pakistan's tactical nuclear programme is the most significant and least understood development in South Asian security in the past two decades. It has redrawn the escalation ladder between two nuclear-armed states that have fought four wars and come close to a fifth on multiple occasions. It has compelled India to rethink its conventional military doctrine. And it has introduced a category of risk — accidental nuclear use, pre-delegated command authority, compressed decision timelines — that the Cold War theorists warned about and that South Asia is now living with in real time.
This piece explains what Pakistan has actually built, why it built it, and why the conventional assumption — that more deterrence is always better — deserves serious scrutiny when applied to weapons small enough to fire at a tank column.
Two Terms You Need to Understand Before We Go Further
Nuclear doctrine is full of jargon that obscures more than it illuminates. Two terms are essential for this piece, and they are worth defining precisely before the analysis begins.
Strategic nuclear weapons are large-yield weapons designed to strike deep targets — cities, command infrastructure, military headquarters, industrial centres. They are the weapons of existential deterrence: the threat of civilisational destruction that prevents one nuclear state from launching a full-scale attack on another. Pakistan's Shaheen-III ballistic missile, with a range of 2,750 kilometres capable of reaching every corner of India, is a strategic weapon. So is its Babur ground-launched cruise missile. These weapons say: if you destroy us, we destroy you. That logic has, by most assessments, functioned as intended since 1998.
Tactical nuclear weapons (TNWs), sometimes called battlefield or non-strategic nuclear weapons, are short-range, lower-yield weapons designed for use on or near the battlefield — against troop concentrations, armoured columns, logistics hubs, or forward military bases. Pakistan's Nasr (Hatf-IX) missile, with a range of 70 kilometres and a yield estimated at between 0.5 and 5 kilotons, is a tactical weapon. Where a strategic weapon says "we will destroy your country," a tactical weapon says "we will destroy your advancing tank brigade." The difference in rhetoric is enormous. The difference in consequence is less clear than it appears.
Pakistan's Nuclear Arsenal — What We Know
Pakistan's nuclear stockpile is estimated at approximately 170 warheads as of 2024–2025, according to both SIPRI and the Federation of American Scientists' Nuclear Notebook. This figure could grow toward 200 by the mid-2020s based on current fissile material production rates. As of early 2024, Pakistan held an estimated 5,300 kilograms of weapon-grade highly enriched uranium and approximately 580 kilograms of weapon-grade plutonium — sufficient for significant further expansion.
Pakistan does not publish its nuclear doctrine as a formal document. What is known comes from official statements, ISPR press releases, and public remarks by serving and retired officials — primarily Lieutenant General (retired) Khalid Ahmed Kidwai, who served as head of Pakistan's Strategic Plans Division for two decades and remains an Advisor to its National Command Authority. Kidwai is the single most authoritative public source on Pakistani nuclear intent, and his statements are treated throughout this piece as T2 expert analysis, not T1 verified fact.
Why Pakistan Built Tactical Weapons — The Cold Start Problem
To understand Pakistan's tactical nuclear programme, you must first understand what it was built to counter: India's Cold Start doctrine.
After the 2001 Indian Parliament terrorist attack — attributed to Pakistan-backed Lashkar-e-Taiba — India mobilised nearly 700,000 troops to the Pakistani border. The mobilisation took almost two months. By the time Indian forces were in position, the diplomatic and international pressure that followed had made actual military action untenable. Pakistan's nuclear signals had been effective. India had been deterred — but not by Pakistan's nuclear arsenal alone. Partly by its own slowness.
Indian military planners drew a lesson from that episode: their mobilisation doctrine was too slow to create credible conventional deterrence. A terrorist attack could occur, India could be internationally restrained from immediate retaliation, and Pakistan's nuclear shield would absorb the consequence. So India began developing a new approach — faster, smaller, and deliberately calibrated to stay below the threshold that would trigger Pakistani nuclear use.
Cold Start, formally acknowledged by India's Army Chief in 2017, envisions multiple division-sized Integrated Battle Groups launching rapid, shallow incursions into Pakistani territory within 48 to 72 hours of a trigger event — fast enough to inflict conventional punishment before the international community can intervene, and shallow enough (the theory went) to avoid crossing Pakistan's nuclear threshold.
The Stability-Instability Paradox
The theoretical framework most relevant to this dynamic was formalised by Glenn Snyder in 1965 and elaborated by Robert Jervis: nuclear weapons create stability at the macro level (preventing full-scale war) while simultaneously enabling instability at the micro level (encouraging lower-intensity conflict, proxy warfare, and coercive brinkmanship below the nuclear threshold). Pakistan exploited this paradox deliberately and successfully for decades — using the nuclear umbrella to sponsor sub-conventional conflict against India while betting that India's fear of escalation would prevent retaliation.
Cold Start was India's attempt to escape this trap — to carve out conventional space below the nuclear threshold where India could punish Pakistan without triggering nuclear use. Pakistan's tactical nuclear programme was the counter-move: by threatening nuclear use at the tactical level, Islamabad sought to collapse the space India was trying to create.
Pakistan's answer to Cold Start was the Nasr missile — a 70-kilometre-range ballistic missile capable of delivering a low-yield nuclear warhead with high accuracy, mounted on a mobile truck launcher that can fire and relocate rapidly. The message was explicit. Kidwai stated publicly in 2015 that the Nasr was built specifically because "some people on the other side were toying with the idea of finding space for conventional war, despite Pakistan's nuclear weapons." Pakistan was closing that space — with a battlefield nuclear weapon.
Sources: FAS Nuclear Notebook 2025; SIPRI Yearbook 2025; CSIS Missile Threat Database; IISS Military Balance 2024
The Central Argument — Why Tactical Nukes Make War More Likely
Pakistan's official position — stated clearly and repeatedly — is that tactical nuclear weapons make war less likely by making India's Cold Start doctrine non-viable. If India knows that a conventional incursion might be met with a nuclear weapon on its tank column, it will not launch the incursion. Deterrence is extended downward, from the strategic level to the battlefield level. War becomes impossible at every rung of the escalation ladder.
This argument is coherent. It is also, on close examination, deeply problematic — for five reasons that the evidence supports.
Problem one: the delegation dilemma. For tactical nuclear weapons to function as a battlefield deterrent, they must be deployable fast — fast enough to stop an advancing armoured column before it overruns Pakistani defensive positions. That speed requirement creates enormous pressure to pre-delegate launch authority to corps-level commanders in the field, rather than requiring authorisation from the National Command Authority in Islamabad. But pre-delegation means nuclear use decisions could be made by a general facing a battlefield crisis, under fire, with incomplete information, in minutes rather than hours. Every serious nuclear theorist from Herman Kahn to Scott Sagan has identified pre-delegation as among the highest-risk elements of any nuclear posture.
Problem two: India's declared response doctrine. India's official nuclear doctrine states that any nuclear use against India — of any yield, at any level — will be met with massive nuclear retaliation. This is not ambiguous. Indian officials have stated it clearly and repeatedly. If that doctrine is credible, then Pakistan using a 1-kiloton Nasr against an Indian tank brigade in the Punjab would trigger India's strategic arsenal in response. A "tactical" exchange becomes a civilisational one. Pakistan's own strategists have pushed back on this — Kidwai himself has argued that it would be "irrational" for India to respond to a small tactical weapon with massive retaliation. But rationality under nuclear pressure is exactly what cannot be guaranteed.
"Kidwai argued it would be irrational for India to respond to a battlefield nuclear weapon with massive retaliation. India's official doctrine says it will. One of them is wrong — and the cost of finding out which is a nuclear exchange."
Swords & Floods Analysis — Drawing on Arms Control Association reporting and IISS Nuclear Deterrence Study (T2)Problem three: the use-it-or-lose-it pressure. Short-range mobile weapons deployed at corps level, designed for battlefield use, face a particular danger in a fast-moving conventional conflict. If an Indian conventional advance is moving quickly through Pakistani defensive lines, a corps commander holding tactical nuclear weapons faces a desperate calculation: use them now, before the advancing force overruns the launcher positions, or risk losing the weapons without use. This "use-it-or-lose-it" pressure is one of the most studied and most dangerous dynamics in nuclear theory. It creates incentives for early nuclear use even when decision-makers might prefer to wait.
Problem four: the signal ambiguity problem. Pakistan's launchers are described as dual-capable — they can fire either conventional or nuclear warheads. In a crisis, India cannot know with certainty whether a Nasr launcher being moved into position is carrying a conventional or nuclear payload. That uncertainty compresses Indian decision timelines and creates incentives for pre-emptive action. The same ambiguity that gives Pakistan flexibility in peacetime creates catastrophic uncertainty in wartime.
Problem five: it reinforces the very behaviour that creates crises. Pakistan's tactical nuclear posture — by making Indian conventional retaliation extremely dangerous — makes the sub-conventional tier below it even safer to exploit. If India cannot conventionally attack Pakistan without risking nuclear escalation, Pakistan's proxy warfare assets operate in an even more protected environment than they did before TNWs. Tactical nukes do not just deter Indian conventional action. They insulate Pakistan's terrorist infrastructure from conventional response.
A 2020 study from NASA's Goddard Institute for Space Studies modelled the climatic consequences of a "limited" nuclear exchange between India and Pakistan — defined as the use of approximately 100 Hiroshima-scale weapons. The findings: global average temperatures would drop by approximately 1.5°C within a year, causing severe disruption to agriculture across the Northern Hemisphere and food insecurity for approximately 2 billion people. The word "tactical" describes the weapon's role on a battlefield. It does not describe its effect on the planet.
A kiloton-scale weapon used on Pakistani soil against an Indian armoured column would still produce a mushroom cloud visible from Lahore. The political, psychological, and escalatory consequences of that image — regardless of yield — would be unlike anything in the nuclear age since 1945. The assumption that tactical use would remain tactical is the most dangerous assumption in South Asian security.
Operation Sindoor and the Fracture in Pakistan's Deterrence Logic
In May 2025, something significant happened that belongs in any honest analysis of this subject: India appears to have called Pakistan's nuclear bluff.
Following the April 2025 Pahalgam terrorist attack — attributed to a Pakistan-based militant group — India launched Operation Sindoor, conducting conventional military strikes against terrorist infrastructure and, notably, Pakistani military targets. Pakistan engaged in nuclear signalling — Prime Minister Sharif reportedly convened the National Command Authority. Pakistani officials made statements about nuclear readiness. The familiar brinkmanship playbook was deployed.
India did not stop. The strikes continued. The operation concluded on terms that Indian Prime Minister Modi described as a "new normal" — a public statement that conventional military strikes against Pakistani territory would follow future terrorist attacks, regardless of nuclear signalling.
What Operation Sindoor Changed
The Bulletin of the Atomic Scientists noted in November 2025 that Pakistan's nuclear deterrence logic was "undermined" by Operation Sindoor — specifically, that India demonstrated a willingness to conduct conventional strikes despite Pakistani nuclear signals. This is a significant shift. For decades, Pakistani nuclear signalling had been sufficient to draw American diplomatic intervention and constrain Indian action. In 2025, it was not sufficient.
Expert analysis suggests Pakistan's nuclear threats are increasingly calibrated not to deter India directly, but to attract third-party intervention — primarily American. When that mechanism fails, as it appeared to in May 2025, the deterrent loses its operational effect. This creates a new and dangerous uncertainty: a Pakistan whose nuclear threats have been called will face pressure to either escalate its signalling (moving closer to the actual nuclear threshold) or accept that its deterrent posture has been structurally weakened.
The implications of this shift are not comforting for either side. A Pakistan whose conventional deterrence has been called — whose nuclear signalling did not stop Indian strikes — faces a dangerous set of choices. It can escalate its nuclear posture to restore credibility. It can deploy tactical nuclear weapons forward to demonstrate resolve. Or it can accept a structural weakening of its deterrent that invites further Indian conventional action in the future. None of these choices reduces risk. All of them increase it.
Kissinger argued in his early work on limited war that coercive nuclear threats only function when the adversary believes they are credible and when a face-saving exit is available. A state whose nuclear threats have been tested and found insufficient faces the worst possible outcome: diminished deterrence and a compulsion to demonstrate resolve in ways that carry genuine escalation risk. Pakistan in the post-Sindoor environment fits this description precisely.
What This Means Beyond South Asia
Pakistan's tactical nuclear programme is not a South Asian curiosity. It is a template — and other states are watching.
Russia's deployment of tactical nuclear weapons in its European posture, and its nuclear signalling during the Ukraine conflict, follows a recognisable logic: the weak state uses tactical nuclear threats to compensate for conventional inferiority and to deter stronger-power intervention. North Korea's ballistic missile programme, increasingly diversified toward shorter-range battlefield systems, reflects a similar calculation. The "poor man's force multiplier" logic that Pakistan pioneered is being adopted wherever conventional asymmetry is severe enough to make nuclear options attractive.
The academic consensus — supported by evidence from SIPRI, the FAS, and serious independent scholarship — is that tactical nuclear weapons do not stabilise deterrence at the level their proponents claim. They lower the threshold for nuclear use. They create command and control risks that strategic weapons do not. And they generate the use-it-or-lose-it dynamics that are most likely to produce nuclear war not through deliberate decision, but through crisis, miscalculation, and compressed timelines.
Pakistan's generals believe they have found a deterrence solution. The evidence suggests they have found a deterrence problem — and dressed it in the language of stability.
"Nuclear weapons prevent war between states that possess them. Tactical nuclear weapons may prevent the wrong kind of war — the kind that can be contained — while making the uncontainable kind more likely."
Swords & Floods Editorial Analysis — Synthesising Narang (T2), FAS Nuclear Notebook (T1), SIPRI (T1)