Introduction

Introduction The contemporary international legal order faces a growing challenge from the increasing resort to Unilateral Coercive Measures (UCMs) as measures outside the framework of the UN Charter. These measures, predominantly imposed as extraterritorial economic sanctions, undermine fundamental principles such as the sovereign equality of states and non-intervention, and their legality has been a subject of intense legal debate. This situation necessitates a reciprocal "rule-making" response from states to counter this phenomenon and solidify the foundational principles of international law. Responding to this trend, the Comprehensive Strategic Partnership Treaty between Iran and Russia presents a novel framework. This research focuses on the legal analysis of Article 19 of this treaty, an article specifically dedicated to countering UCMs, elevating the document to a normative statement with international implications.

1. Research Gap and Objective

A significant gap in the existing legal literature is the analysis of bilateral treaties as active instruments for "rule-making" against controversial legal practices. Most research has either analyzed the nature of UCMs or examined their political and economic effects. This article addresses the question of how a bilateral treaty, such as the one between Iran and Russia, can play a role beyond a bilateral cooperation by serving as a concrete example of "state practice" and "opinio juris" to participate in the formation and development of customary international law. The importance of this topic stems from the fact that Article 19 provides a specific legal characterization of these measures and establishes clear negative and positive obligations to counter them. Therefore, the central question is whether Article 19 is merely a bilateral defense mechanism or a juridical act aimed at influencing the international legal order.

2. Methodology

This research employs a descriptive-analytical methodology. In the descriptive part, it begins by explaining the concept of UCMs, distinguishing them from similar notions (such as retorsion and countermeasures), and examining their legal status under sources of international law, including the UN Charter, international jurisprudence (particularly the Nicaragua case), and UN documents. In the analytical part, the content of Article 19 of the Iran-Russia treaty is meticulously dissected, and its resulting obligations are categorized and analyzed under three headings: "legal characterization," "negative obligations," and "positive obligations." Finally, utilizing the theoretical framework of the International Law Commission on the identification of customary international law, the article assesses the capacity of this provision to function as the two key elements of "state practice" (usus) and "legal belief" (opinio juris).

3. Key Findings

The principal findings of the research indicate that Article 19 is a sophisticated, multi-layered mechanism. First, by describing UCMs as an "internationally wrongful act," the article adopts a distinctly legal stance, directly challenging the legitimacy of these measures. This targets the claim by sanctioning states that their actions are consistent with the doctrine of "countermeasures." Second, its negative (non-adherence to third-party sanctions) and positive (cooperation to mitigate effects) obligations create an operational shield that goes beyond mere political declarations. Third, and most importantly, this article, as a formal and binding "juridical act," serves as a prominent example of the practice and legal conviction of two significant international actors. This practice is consistent with their prior and continuous positions in international forums and contributes significantly to the accumulation and consolidation of the practice of states opposing unilateralism.

4. Contribution to the Field

This article contributes to the existing body of knowledge in international law in several ways. First, it fills a research gap by providing a detailed legal analysis of a new and strategic treaty. Second, moving beyond a substantive analysis of sanctions, it addresses the "legal agency" of states through bilateral treaties to counter unfavorable normative trends, demonstrating how the instrument of a treaty can be used to influence customary international law. Third, it offers a comprehensive and interdisciplinary analysis by linking the law of treaties, the law of state responsibility, and the sources of international law. This research provides new insights into the legal strategies available to states for resisting unilateralism and for striving to shape an international order based on multilateralism.

5. Implications and Applications

The findings of this research have significant theoretical and practical implications. On a theoretical level, the article contributes to a better understanding of the dynamics of customary international law formation in the contemporary world, especially the role of States in this process. On a practical level, the analysis can serve as a model for other states facing UCMs to develop similar agreements. Furthermore, international lawyers and legal counsels can cite Article 19 in their arguments against extraterritorial sanctions in domestic courts or arbitral tribunals as evidence of the practice and opinio juris of a significant portion of the international community. For policymakers, this analysis clarifies that strategic partnerships can have profound legal dimensions that enhance diplomatic leverage and economic resilience.

6. Conclusion

Ultimately, this research concludes that Article 19 of the Iran-Russia Comprehensive Strategic Partnership Treaty is not merely a defensive clause in a bilateral agreement; it is a calculated normative statement aimed at influencing the international legal order. By challenging the legitimacy of UCMs and providing a practical model for countering them, the article acts as both a shield and a sword: a shield to protect bilateral relations from external pressures, and a sword to actively participate in the legal battle against unilateralism. This provision is a prominent example of the effort to move towards a multilateral legal order based on the rule of law and has the potential to be cited as a landmark in the legal history of countering unilateral sanctions.