Preemptive Warfare and International Law: A Critical Analysis of Us–Israel Military Actions against Iran

Abstract

The increasing use of preemptive military force in contemporary international relations has intensified legal and academic debates concerning the scope of self-defense under international law. This study examines the legality of the United States and Israeli military actions against Iran by assessing their compliance with the legal framework governing the use of force. The primary objective is to determine whether these military operations can be justified under Article 51 of the United Nations Charter and the established principles of customary international law. The study adopts a qualitative doctrinal legal research design based on the systematic examination of primary legal sources, including the United Nations Charter, relevant international treaties, judgments of the International Court of Justice (ICJ), United Nations Security Council resolutions, and official state statements. Secondary sources, such as scholarly books, peer-reviewed journal articles, legal commentaries, policy reports, and expert analyses, are also utilized to strengthen the legal interpretation and comparative analysis. The findings reveal that Article 2(4) of the United Nations Charter establishes a general prohibition on the use of force, while Article 51 recognizes self-defense only under narrowly defined circumstances involving an actual or imminent armed attack. The analysis demonstrates that the legality of preemptive self-defense remains one of the most controversial issues in international law, whereas preventive warfare lacks broad legal acceptance and is generally regarded as inconsistent with the Charter framework. Furthermore, the study finds that the principles of necessity, proportionality, and imminence continue to serve as indispensable legal conditions for the lawful exercise of self-defense. Military operations undertaken without convincing evidence of an imminent threat or without authorization from the United Nations Security Council raise significant legal concerns and challenge the collective security system established by the Charter. The study concludes that preserving international peace, state sovereignty, and the rule of law requires a strict interpretation of Article 51, greater reliance on peaceful dispute resolution mechanisms, enhanced accountability for unlawful uses of force, and stronger commitment to the multilateral legal order. The findings contribute to the evolving scholarship on international law, the lawful use of force, and the legal regulation of preemptive military action in the twenty-first century.