As sustained air operations continue across parts of the Middle East, attention has increasingly focused on the comparative military strength of the United States and Iran, two states whose confrontation carries profound strategic, legal, and diplomatic implications. While discussions of military capability often emphasise technology, troop numbers, and defence spending, any serious analysis must also evaluate the legal frameworks that regulate the use of force in international relations. The evolving confrontation between these two states, therefore, raises questions not only about battlefield capacity but also about compliance with international law, constitutional war powers, and the broader stability of the global security system. The foundational legal framework governing interstate conflict remains the United Nations Charter. Exceptions exist only under two circumstances. The first is authorisation by the United Nations Security Council under Chapter VII of the Charter. The second is the inherent right of self-defence recognised in Article 51 when an armed attack occurs. In the absence of either condition, military operations risk being interpreted as violations of international law. In analysing the military balance between the United States and Iran, it is therefore necessary to understand that the legitimacy of force does not depend solely on power but also on legal justification under international norms.
The military structure and strategic doctrine of the United States
The United States Department of Defense oversees the most technologically advanced military system in the world, supported by an extensive global network of alliances, overseas bases, and logistical infrastructure. The United States armed forces include the Army, Navy, Air Force, Marine Corps, and Space Force, each operating under a unified command structure governed by the National Security Act and subsequent defence legislation. From a capability perspective, the United States maintains overwhelming superiority in air power, long-range strike capability, intelligence systems, and advanced surveillance technologies. The United States Air Force operates a fleet of fifth-generation aircraft, including the F-22 Raptor and F-35 Lightning II, which are designed to achieve air superiority in contested environments. In addition, the United States Navy maintains aircraft carrier strike groups capable of projecting air power across vast distances. Strategic deterrence also forms a central component of the United States military doctrine. Under the Nuclear Posture Review framework, the United States maintains a nuclear triad consisting of land-based intercontinental ballistic missiles, submarine-launched ballistic missiles, and strategic bombers. Although nuclear weapons are governed by international arms control treaties and non-proliferation commitments, their existence shapes the broader strategic environment in which conventional conflicts occur. From a legal standpoint, the use of military force by the United States must also comply with domestic constitutional constraints. Under the United States Constitution, Congress holds the authority to declare war, while the President serves as Commander in Chief of the armed forces. The War Powers Resolution of 1973 was enacted to ensure congressional oversight of extended military engagements. This statutory framework requires the executive branch to notify Congress when deploying armed forces into hostilities and limits the duration of such operations without legislative authorisation.
Iran’s asymmetric defence strategy and regional military capabilities
In contrast to the global military reach of the United States, Iran has developed a defence strategy built primarily upon regional influence and asymmetric warfare capabilities. Iran’s armed forces consist of two principal institutions. The first is the regular Iranian military known as the Artesh, which includes ground forces, naval forces, and an air force responsible for conventional defence operations. The second is the Islamic Revolutionary Guard Corps, an institution created after the Iranian Revolution with the mission of safeguarding the political system and projecting influence beyond national borders. Iran has invested heavily in ballistic missile development, drone technology, and naval capabilities designed to challenge adversaries in the Persian Gulf region. These capabilities form part of a broader deterrence strategy aimed at offsetting the technological superiority of larger military powers. Iranian naval doctrine emphasises control over strategic waterways such as the Strait of Hormuz, a critical maritime corridor through which a significant portion of global oil shipments passes. The strategic importance of this waterway introduces an additional legal dimension governed by international maritime law. The United Nations Convention on the Law of the Sea guarantees freedom of navigation through international straits used for global transit. Any attempt to disrupt commercial shipping in such waterways could raise serious legal consequences and potentially trigger collective security responses. Iran’s regional influence also extends through alliances with non-state actors and allied groups across parts of the Middle East. While such relationships enhance Iran’s strategic reach, they also generate legal controversies under international law regarding the use of proxy forces and the principle of state responsibility.
The humanitarian law obligations that constrain modern warfare
Beyond the question of strategic power lies the equally important issue of humanitarian law. Even when states claim legal justification for the use of force, the conduct of hostilities must comply with the rules of international humanitarian law derived from the Geneva Conventions and their Additional Protocols. These rules require combatants to distinguish between military objectives and civilian populations, to ensure that attacks remain proportionate, and to take precautions to minimise harm to civilians. Air strikes, in particular, raise complex legal questions regarding target verification, proportionality assessments, and the protection of civilian infrastructure. Modern warfare increasingly occurs in densely populated urban environments where civilian and military assets are often intertwined. As a result, commanders must evaluate each strike through rigorous legal review processes to determine whether the anticipated military advantage justifies the potential risk to civilian life. Failure to comply with these standards may expose states or individual commanders to allegations of war crimes under international criminal law. Institutions such as the International Criminal Court have jurisdiction to investigate serious violations of humanitarian law when national authorities fail to conduct credible investigations.