Flashpoints | Security | South Asia

How Water Is Becoming Pakistan’s Nuclear Threshold

The real danger lies not in the immediate scarcity of Indus water flowing from India into Pakistan but in the widening gap between how they interpret the same facts.

The River Indus makes it way through the city of Sukkur in Pakistan’s Sindh province, August 15, 2021.

In a speech at the Stockholm Water Symposium in August 1995, World Bank Vice President Ismail Serageldin warned that “the wars of the next century will be fought over water.” Few expected that the warning would come true this early in the new century, and even fewer expected it to play out between two nuclear-armed rivals.

In recent months, Pakistan has given unusual attention to the Indus Waters Treaty (IWT), with a steady stream of statements from state officials and extensive media coverage — all signaling how much weight Islamabad now places on its water dispute with India. Last year, Pakistan’s National Security Committee explicitly and bluntly warned, “Any attempt to stop or divert the flow of water belonging to Pakistan … will be considered as an Act of War and responded with full force across the complete spectrum of National Power.” The phrase “complete spectrum” is an implicit reference to nuclear weapons.

New Delhi has repeatedly signaled its intent to deny Pakistan water if it continues to back terrorism targeting India. That posture sits in open contravention of the IWT’s provisions. For Islamabad, this is no longer a matter of transboundary resource management. It is rapidly becoming a question of national survival.

Pakistani officials no longer characterize India’s treaty suspension as leverage aimed at renegotiating water sharing or counterterrorism. The prevailing view within Islamabad’s national-security establishment holds that New Delhi is pursuing regional hegemony and seeking to compress Pakistan’s strategic space.

Having failed to achieve escalation dominance through conventional force — as demonstrated by the four-day military clash in May 2025 — India is now presumed to be pivoting toward sub-conventional, non-kinetic instruments of coercion. Hydro-hegemony is among the most potent tools in that arsenal.

At the Islamabad seminar on IWT held on June 30, Lieutenant General Aamer Riaz (Retd) described India’s approach as “born out of coercive strategy.” Pakistani policymakers increasingly believe New Delhi intends to institutionalize this lever — one that could induce drought during the sowing season or flash flooding at the height of monsoon discharge. Public debate in Pakistan has focused primarily on India’s technical capacity to divert the Indus system’s flows.

But that framing overlooks the more consequential variable: what actually shapes Pakistan’s threat perception is the belief that India is methodically acquiring and entrenching hydro-coercion as a durable capability. Moreover, Pakistan fears that India intends to exploit upstream leverage to constrain Islamabad’s room to maneuver in any future negotiations on other issues.

This perceptual shift recalibrates the entire deterrence equation. For a state whose agriculture, food security, hydropower, and demographic survival are structurally tied to the Indus basin, politicized water ceases to be merely an environmental grievance and becomes an existential vulnerability. The real danger lies not in immediate scarcity but in the widening gap between how New Delhi and Islamabad interpret the same facts. India appears to view hydro-coercion as calibrated pressure intended to stay below the threshold of war. Pakistan increasingly reads it as an existential threat, lowering its own escalatory threshold and widening the space in which nuclear signaling becomes thinkable. It is this gap in perception, more than any gap in material capability, that now constitutes the region’s........

© The Diplomat