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Use of Force

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A plume of smoke rises above road traffic after an explosion on March 2, 2026 in Tehran, Iran. The United States and Israel continued their joint attacks that erupted on February 28. Iran retaliated by firing waves of missiles and drones at Israel, and targeting U.S. allies in the region. (Photo by Majid Saeedi/Getty Images)

Aggression by the United States and Israel, Misdirected Self-Defense by Iran, and Collective Self-Defense of Gulf States

Analysis of the legality of U.S.-Israel actions against Iran, Iran’s response, and third-party states’ legal options and obligations under the UN Charter.
Screenshot of Memorandum for Legal Advisor, National Security Council Re: Proposed War Department Operation to Support Law Enforcement Efforts in Venezuela, published December 23, 2025.

The Trump Administration’s Theory of Constitutional War Powers: “The President Could Decide”

The legal memo justifying its Venezuela operations provides insight into the administration's use-of-force decisions and the factual evidence undergirding them.
A plume of smoke rises following a reported explosion in Tehran on February 28, 2026. Israel's defence ministry announced February 28 it had launched a "preemptive strike" on Iran as sirens sounded in Jerusalem and people across the country received phone alerts about an "extremely serious" threat.

International Reactions to Military Strikes on Iran: A Tipping Point for the UN Charter?

Positions taken at the UN Security Council are a harbinger of whether the legal cornerstone of the international order that is designed to maintain world peace can hold.
Three men wearing prostheses and a woman in a colorful long dress sit in a mostly empty room with bare floors and light coming from windows at the back.

Risk of Renewed War in Tigray: Painful Reminders From Ethiopia’s Last War Demand Action to Prevent Another

With the possibility of renewed fighting in Ethiopia's Tigray region, reminders of the toll and recommendations for the world to take preventive action.
Abraham Lincoln (CVN 72) sails alongside Arleigh Burke-class guided-missile destroyer USS Frank E. Petersen Jr. (DDG 121) and Lewis and Clark-class dry cargo ship

Expert Q&A: Are U.S. Threats or Use of Force Against Iran Lawful?

Experts examine the international law issued raised by the U.S. threats and potential strikes against Iran.
Protesters hold Iranian pre-Islamic revolution of 1979 flags in front of the United Nations office in Geneva​, Switzerland on February 17, 2026.

What the Current Crises Facing Iran Mean for Human Rights and Rules on the Use of Force

The human rights crisis in Iran reveals the limits of a legal system designed to restrain force even when restraint carries profound human costs.
A man in a red, navy and white plaid shirt sits at a table constructing an electronic device in what appears to be a makeshift workroom.

Ukraine’s Long War and History’s Lessons for the West

Russia’s long war on Ukraine is a world-shaping conflict, and only sustained U.S. and European pressure can secure the continent's future and the global order.
A wide view of the Security Council meeting on threats to international peace and security, regarding the situation in Venezuela.

U.S. Allies and Adversaries’ Reactions to Operation Absolute Resolve to Capture Maduro: UN Security Council Emergency Meeting

Key excerpts from the Jan. 5 U.N. Security Council meeting on the U.S. operation that captured Venezuela’s Nicolás Maduro.
Military unmanned aerial vehicle at sunset.

Is the U.S. Conducting Air Strikes Against Al Qaeda in Yemen?

Despite official silence, multiple reports indicate renewed U.S. drone strikes in Yemen targeting AQAP militants, reviving debates on transparency and endless war.
Screenshot of the OLC Memo

The OLC Maduro Memorandum: Assisting in War Sustaining Activities is Not Direct Participation in Hostilities

A troubling OLC memo claims civilians aiding “war-sustaining activities” can be lawfully targeted—an unsupported interpretation that weakens civilian safeguards.
US Secretary of State Marco Rubio testifies during a Senate Foreign Relations Committee hearing

Five War Powers Takeaways from the Senate’s Venezuela Hearing

The Senate's hearing with Rubio offered little solace to those concerned about the use of force against Venezuela.
The US Navy warship USS Sampson (DDG 102) docks at the Amador International Cruise Terminal in Panama City on September 02, 2025. Venezuelan President Nicolas Maduro said on September 1, 2025, that eight US military vessels with 1,200 missiles were targeting his country, which he declared to be in a state of "maximum readiness to defend" itself. (Photo by MARTIN BERNETTI/AFP via Getty Images)

Arbitrary Killings or War Crimes? Why It Matters How the U.S. Strikes in the Caribbean Are Categorized

Analysis of U.S. military strikes in the Caribbean and the legal consequences of classifying them as arbitrary killings or war crimes under international law.
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