Iran Threatens "Act of War" Response to Sanctions — Hormuz Closure Risk Assessed

Iran's Supreme National Security Council warned on August 23 that countries participating in or supporting the US economic campaign against Iran could be treated as committing an "act of war," per analysis by Diplomacy and Law. Legal scholars noted that "act of war" is not a controlling legal category under the UN Charter: Article 2(4) prohibits the threat or use of force, while Article 51 preserves self-defense rights against armed attacks, but economic sanctions — even severe ones — do not generally qualify as armed attacks under international law. The key practical risk for law firm clients is not the legal classification but the operational consequence: the Hormuz Strait, through which approximately 20% of global oil supply transits, remains a chokepoint under Iranian influence, and the UAE's suspension of trade with Iran following a missile launch has introduced additional regional uncertainty. Shipping, insurance, energy trading, and finance clients with Middle East exposure need updated force-majeure, material-adverse-change, and war-risk insurance assessments as conditions evolve.