Water-sharing agreements are among the most sensitive forms of international treaties because they directly affect the survival, agriculture, economy and security of nations. The Indus Waters Treaty (IWT), 1960, between India and Pakistan is one of the world’s most significant transboundary water agreements. It has continued to operate despite wars, diplomatic crises and prolonged political tensions between the two countries.
However, the legal position of the Treaty has come under unprecedented pressure following India’s decision in April 2025 to place the Treaty in abeyance after the Pahalgam terror attack. India linked the continuation of the Treaty to Pakistan ending its alleged support for cross-border terrorism. Pakistan rejected India’s decision and maintained that the Treaty remained legally binding.
The dispute entered a new phase in 2026. On 31 August 2026, the Hague-based Court of Arbitration concluded that the Treaty remained in force and that the grounds cited by India did not justify its unilateral suspension or termination. India rejected the ruling, maintaining that the Court had no jurisdiction over India’s sovereign decision.
This development raises a fundamental question of international law:
Can a State unilaterally suspend an international water treaty because of national-security concerns, or does the principle of pacta sunt servanda require the State to continue performing its treaty obligations?
The answer is legally complex because it involves the relationship between treaty law, national security, sovereignty, state responsibility and international dispute settlement.
What Is the Indus Waters Treaty?
The Indus Waters Treaty was signed in 1960 between India and Pakistan with the assistance of the World Bank. The Treaty established a system for sharing the waters of the Indus River system.
Broadly, the Eastern Rivers—Ravi, Beas and Sutlej—were allocated primarily for India’s unrestricted use, while the Western Rivers—Indus, Jhelum and Chenab—were allocated primarily to Pakistan, subject to specific rights granted to India under the Treaty.
The Treaty also established the Permanent Indus Commission and detailed mechanisms for resolving disagreements between the two countries.
The importance of the Treaty lies in its durability. It survived periods of armed conflict and serious diplomatic hostility between India and Pakistan.
That is why the 2025 decision to place it in abeyance—and the continuing dispute in 2026—is legally and geopolitically significant.
Why Did India Put the Treaty in Abeyance?
Following the Pahalgam terrorist attack in April 2025, India announced several measures against Pakistan, including placing the Indus Waters Treaty in abeyance.
India’s position was essentially that the existing framework of cooperation could not continue normally while Pakistan allegedly supported cross-border terrorism against India.
The decision was therefore presented not merely as a water-management decision but as a national-security and diplomatic response.
India has continued to maintain that its decision represents a sovereign act and has rejected international proceedings that it considers lacking jurisdiction over the issue.
Pakistan, however, has argued that the Treaty is a binding international legal instrument and does not provide India with a unilateral right to suspend its operation.
This difference in interpretation forms the heart of the dispute.
Does the Treaty Allow Unilateral Suspension?
This is perhaps the most important legal question.
If the Indus Waters Treaty does not contain an express unilateral suspension clause, can India still suspend it under general international law?
The Treaty contains detailed provisions concerning cooperation, modification and dispute resolution. However, it does not contain a conventional clause allowing either party to simply suspend the entire Treaty whenever bilateral relations deteriorate.
The recent Court of Arbitration examined whether India’s stated grounds—including sovereignty and security considerations—could justify suspension or termination under international law. It concluded that they did not.
The decision therefore reinforces the principle that a State cannot automatically escape treaty obligations merely by declaring that the treaty is placed “in abeyance.”
The Principle of Pacta Sunt Servanda
One of the most fundamental principles of international treaty law is pacta sunt servanda, meaning that agreements must be kept.
Under Article 26 of the Vienna Convention on the Law of Treaties, 1969, every treaty in force is binding upon its parties and must be performed in good faith.
Although India is not a party to the Vienna Convention, many of its treaty-law principles are widely regarded as reflecting customary international law.
Therefore, the basic international-law position is that States cannot simply disregard treaty obligations whenever political circumstances change.
However, international law also recognises limited circumstances in which treaty obligations may be affected.
These include situations such as material breach, impossibility of performance, fundamental change of circumstances and certain circumstances relating to self-defence or necessity, subject to strict legal conditions.
The existence of these exceptions means that the question is not simply whether India has sovereignty, but whether the particular legal requirements for suspending a treaty have been satisfied.
Can National Security Override Treaty Obligations?
India’s strongest argument lies in the relationship between treaty obligations and national security.
A State does not surrender its sovereignty simply because it enters into an international treaty. States retain the inherent right to protect their national security.
But sovereignty does not mean that international commitments become optional.
Can national security become a blanket justification for suspending any international treaty?
If the answer were always yes, the stability of international agreements would be seriously weakened.
For this reason, international law generally requires a close connection between the security situation and the specific treaty obligation being suspended.
India may argue that continued cooperation under the Treaty becomes untenable when the other party is allegedly responsible for serious security threats. Pakistan, on the other hand, can argue that the Treaty regulates water allocation and contains no provision linking its operation to broader political or security relations.
This creates the central legal tension between national security and treaty stability.
What Did the 2026 Court of Arbitration Decide?
The 2026 proceedings have significantly changed the legal debate.
On 31 August 2026, the Court of Arbitration at The Hague examined India’s decision to place the Treaty in abeyance. The Court concluded that the grounds cited by India did not justify suspension or termination and held that the Treaty remained in force.
The Court also issued interim measures concerning the Ratle hydroelectric project and restricted certain construction activity pending further technical assessment.
Pakistan regarded the ruling as confirmation of its position.
India, however, rejected the decision. The Ministry of External Affairs maintained that the Court was not legally competent to pronounce upon India’s sovereign decision and described the arbitration body as improperly constituted.
Therefore, the dispute now has two competing narratives:
- Pakistan relies on the continuing binding nature of the Treaty and international dispute-resolution mechanisms.
- India relies on its rejection of the tribunal’s jurisdiction and the sovereign nature of its decision.
Does the Court’s Decision Automatically Bind India?
This question requires careful consideration.
An international tribunal can only exercise authority within the jurisdiction accepted under the relevant treaty or another valid source of consent.
India has consistently objected to the Court of Arbitration process in the present dispute and has argued that the mechanism was improperly invoked.
Therefore, India does not accept the legal authority of the Court’s ruling.
At the same time, the Treaty itself contains a dispute-resolution structure involving the Permanent Indus Commission, a Neutral Expert and a Court of Arbitration, depending upon the nature of the dispute.
This creates a complicated jurisdictional question: whether Pakistan’s proceedings fall within the Treaty mechanism and whether the Court was properly constituted despite India’s objections.
The dispute therefore illustrates an important principle of international law:
Before asking whether an international award is binding, one must first ask whether the tribunal had valid jurisdiction to issue it.
Treaty Law Versus Sovereignty
The dispute ultimately raises a broader question about the relationship between international law and State sovereignty.
India can legitimately argue that no international institution can simply dictate India’s sovereign security policy.
However, Pakistan can equally argue that sovereignty includes the freedom to voluntarily enter into international agreements and once a State enters into a binding treaty, it accepts legal obligations arising from that commitment.
Thus, sovereignty and international law are not necessarily opposites.
A sovereign State can choose to enter into a treaty. Once it does so, its sovereignty operates within the legal framework created by that treaty.
This is why the principle of pacta sunt servanda remains so important.
What About Termination or Modification?
Another important distinction must be made between suspension, termination and modification.
Suspension temporarily stops the operation of treaty obligations.
Termination brings the treaty relationship to an end.
Modification changes the terms of the agreement.
The Indus Waters Treaty itself provides a mechanism for modification by a duly ratified treaty between the two governments. It therefore does not treat the agreement as an ordinary political arrangement that can simply be discarded whenever relations deteriorate.
This makes India’s use of the term “abeyance” legally significant.
Can a State avoid the legal requirements for suspension or termination simply by using the word “abeyance”?
The answer would depend upon the substance of the State’s conduct rather than merely the terminology used.
If a State stops performing its treaty obligations, the legal consequences may arise regardless of whether the action is described as “suspension,” “abeyance” or another term.
The Humanitarian Dimension
The dispute is not merely about international law.
The Indus river system supports millions of people, particularly in Pakistan’s agricultural economy. The Treaty is therefore directly connected with food security, irrigation and livelihoods. The consequences of prolonged uncertainty could extend far beyond diplomatic relations.
At the same time, India also has legitimate developmental interests in using its river resources for hydropower and other purposes within the limits of its legal rights.
Therefore, the challenge is to balance sovereignty, development, environmental concerns, security and humanitarian interests.
Turning water into a permanent instrument of political retaliation could create serious regional consequences.
What Should India Do?
From a legal perspective, India has several possible approaches.
First, India can continue to challenge the jurisdiction of the Court of Arbitration and maintain its legal objections.
Second, India can seek to resolve technical disputes through mechanisms recognised under the Treaty, where applicable.
Third, both countries could explore modification of the Treaty through mutual consent if changing environmental, demographic and technological realities make the original framework inadequate.
Finally, India can continue developing projects that are legally permissible under its interpretation of the Treaty while avoiding actions that unnecessarily escalate the dispute.
The larger objective should be to ensure that India’s legitimate water and security interests are protected without creating a precedent that weakens international treaty law.
Conclusion
The Indus Waters Treaty dispute of 2026 is much more than a disagreement between India and Pakistan over rivers. It is a test of one of the most basic principles of international law: how far can a sovereign State go when its national-security interests conflict with an existing treaty obligation?
India’s position is that national security and sovereignty cannot be subjected to the authority of a tribunal whose jurisdiction it does not recognise. Pakistan’s position is that the Treaty remains binding and cannot be unilaterally placed in abeyance.
The recent Court of Arbitration ruling has strengthened the international-law argument that unilateral suspension is not automatically permissible. India, however, has rejected the ruling and continues to challenge the tribunal’s authority.
Ultimately, the dispute demonstrates that international treaties are built on both consent and continuity.
If every State could unilaterally suspend a treaty whenever political relations deteriorated, could any international agreement truly provide long-term legal certainty?
At the same time, international law cannot ignore genuine national-security concerns.
The real challenge, therefore, is not simply deciding whether India is “right” or Pakistan is “right.” It is determining whether the existing legal framework provides a lawful path through which security concerns, sovereign interests and treaty obligations can coexist.
The Indus Waters Treaty survived wars between India and Pakistan. Its future will now test whether international water law can survive one of the deepest political crises in the relationship between the two countries.
