Jus ad Bellum

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U.S. forces patrol the Arabian Sea near M/V Touska on April 20, 2026, after firing upon the Iranian-flagged vessel that the U.S. accused of attempting to violate the U.S. naval blockade of Iranian ports near the Strait of Hormuz.

Blockade and Article 2(4) of the UN Charter

"The U.S. military’s enforcement of the ongoing naval blockade of Iran may have now resulted in fresh violations of the U.N. Charter against four entirely different countries."
Police and forensic investigators examine the location of impact after a Russian drone struck an apartment building in Galati, eastern Romania.

Drones Over Europe: The Prohibition on the Use of Force and Unintended Harm

Russia’s drone incursions into E.U. territory raise important questions about how unintended engagements are regulated under international law.

Collection: U.S. Lethal Strikes on Suspected Drug Traffickers, Operation Southern Spear, Operation Absolute Resolve

Collection of expert analysis on the legality of the U.S. strike on Venezuelan vessels in the Caribbean, the consequences of the strike, and related issues.
US Department of State building with sign in front

On the State Department Memorandum “Operation Epic Fury and International Law”

Former State Department attorney's critique of the Department's Iran war memorandum on “Operation Epic Fury and International Law.”

A Primer on Just War Theory and the Iran War

Leading scholar explains just war theory and the Iran war. An assessment of the Trump administration's response to the Catholic Church.
An overhead view of the Pentagon building in Washington, DC.

In Response to the Letter by International Law Experts

Four experts, who have each served as Senior Law of War Advisor, respond to Letter by 100+ international law experts on Iran war published at Just Security.
Woman sitting down, holding an AK-47 in her lap, in a military base hidden among the mountains in Khalifa, Erbil Province, Iraq.

The International Legal Consequences and Imprudence of U.S. Assistance to Kurdish Rebels in Iran

U.S. policies of funding rebel groups to achieve shared strategic objectives while turning a blind eye to ideology and international law has proven to be myopic time and again
Plumes of smoke rise following reported explosions in Tehran early on March 3, 2026. The United States and Israel started striking Iran on February 28, killing Iran's supreme leader and top military leaders, and prompting authorities to retaliate with strikes on Israel and across the Gulf. (Photo by ATTA KENARE / AFP via Getty Images)

Over 100 International Law Experts Warn: U.S. Strikes on Iran Violate UN Charter and May Be War Crimes

Over 100 international law experts sign letter on Iran War, UN Charter, and international humanitarian law.
​Grey boxes filled with fragments of ancient pottery collected after an Israeli strike near the archaeological site of the Roman hippodrome in the southern Lebanese city of Tyre.

Self-Preservation and the Erosion of International Law

It is the violation of fundamental principles of international law that ultimately constitutes an existential threat to all members of the international community.

Fighting an Illegal War and Fighting a War Illegally: the Link between Regime Change Operations and International Humanitarian Law Violations

The relationship between regime change and IHL is of inherent tension, incentivizing battlefields where the law is viewed as an obstacle rather than an essential constraint.
Wide view of Tehran’s skyline with several tall plumes of grey smoke rising between apartment buildings under a hazy, grey sky.

An Unserious Justification for an Unnecessary War: Assessing the U.S. “Article 51” Letter to U.N. on Iran War

Former US State Department attorney writes that the United States' "Article 51" letter to the UN Security Council fails to identify legal basis for Iran attack.
Picture Of United Nations Flags

Operation Epic Fury: Reports of the Death of International Law are Greatly Exaggerated

"I am sure some restrictionists will critique my analysis by claiming it is not grounded in orthodox interpretations of international law."
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