The IWT ruling and the coming age of water coercion

AI Summary

The Court of Arbitration upheld the Indus Waters Treaty, rejecting India’s attempt to suspend it based on allegations of cross-border terrorism and other claims. This ruling underlines the binding nature of treaty obligations despite political and security tensions between India and Pakistan, with broader implications for international law.

The Court of Arbitration’s latest ruling on the Indus Waters Treaty deserves attention far beyond Pakistan and India. On August 31, the Court unanimously reaffirmed that the Treaty remains fully in force and rejected the grounds advanced by India for placing it in “abeyance”. It also imposed interim restrictions on specified construction at the Ratle Hydroelectric Plant while the Treaty’s adjudicatory processes continue. The immediate legal consequence is straightforward: India remains bound by the obligations it accepted under the 1960 Treaty. The wider significance is, however, more consequential. As water stress intensifies and upstream infrastructure expands, geographical control over rivers will increasingly create strategic leverage. The Court’s decision therefore arrives at an important moment. It establishes that physical advantage does not confer unlimited political discretion, and that binding obligations cannot be switched off through unilateral declarations. There is another aspect of the decision with potentially wider consequences for international law. India explicitly linked the Treaty’s continued operation to its allegations of cross-border terrorism, declaring in April 2025 that the IWT would remain in abeyance until Pakistan “credibly and irrevocably” ended such support. The Court examined terrorism alongside the other grounds invoked publicly by India, including sovereignty, alleged material breach, changing circumstances and armed conflict. It found that none provided a legal basis for suspending or terminating the Treaty. That finding matters well beyond the Indus basin. An unjust correlation International law would become dangerously unstable if treaty obligations could be made contingent upon unilateral accusations arising from another sphere of interstate relations. Terrorism is a grave security issue and states retain the rights available to them under international law to address it. A water-sharing treaty, however, cannot be suspended merely because one party attaches a security allegation to its bilateral relationship with another. Otherwise, contested political claims could become self-created escape clauses from international obligations. The chronology makes the attempted linkage particularly difficult to sustain. The disputes concerning India’s Kishenganga and Ratle hydroelectric designs long predate the April 2025 attack that India subsequently cited in placing the Treaty in abeyance. Pakistan initiated the present arbitration in August 2016. Ratle’s design had been under dispute years earlier, while Kishenganga had already been the subject of international adjudication well before the latest deterioration in relations. The Court itself drew attention to this chronology when considering India’s arguments. This distinction is important. International adjudication serves, among other purposes, to separate legal obligations from the fog of political accusation and propaganda that often accompanies interstate crises. Once allegations from an unrelated security dispute are allowed to determine whether a treaty continues to bind, legal predictability gives way to political discretion. The stronger party gains the ability to define both the grievance and the consequence. That danger will grow as water becomes more strategically valuable. The stress of water A report by the World Resources Institute forecasts that the demand for water worldwide may increase by 20-25 per cent by 2050, and another billion people will experience very high risk of water stress. Over three billion people have already become reliant on transboundary water systems. In many of these basins, geography produces an unavoidable asymmetry: one country controls infrastructure upstream while another depends upon predictable flows downstream. Modern hydrological leverage can also be exercised without dramatically “turning off” a river. Reservoir operations, the timing of releases, construction choices and control over hydrological information can influence agriculture, electricity generation, flood planning and economic confidence downstream. The Mekong illustrates this emerging reality. Research by the Stimson Centre’s Mekong Dam Monitor has documented how upstream dam operations can significantly alter downstream flows during periods of scarcity. The significance lies in the capability created by infrastructure. An upstream state can acquire considerable influence over the timing and predictability of water reaching countries hundreds or thousands of kilometres away. The Nile presents another expression of hydrological asymmetry. Ethiopia’s Grand Ethiopian Renaissance Dam has demonstrated how a major upstream project can alter political calculations across an entire basin, where development priorities, national sovereignty and downstream water security intersect. Why it all matters These cases suggest that 21st century water coercion may look different from the old predictions of “water wars”. It can operate in