Armed Conflict

Just Security’s expert authors provide analysis on the legal, policy, and strategic dimensions of armed conflict, including the Russia-Ukraine war, the Israel-Hamas war, counterterrorism operations, conflicts in the Middle East and North Africa, and other armed conflicts across the globe, with a focus on international humanitarian law, war crimes and accountability, mitigating and remedying civilian harm, and the humanitarian impacts of warfare.

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3,562 Articles
Wide view of Tehran’s skyline with several tall plumes of grey smoke rising between apartment buildings under a hazy, grey sky.

Was Targeting Ayatollah Khamenei and Other Iranian Leaders Lawful? What Precedents Does It Set?

After Iran’s supreme leader, Ali Khamenei was killed in a U.S. and Israeli attack, a key question arises: when is striking a member of the enemy leadership lawful under the laws…
U.S. Secretary of State Marco Rubio addresses the press before briefing House and Senate leaders on US military action in Iran, at the US Capitol in Washington, DC, on March 2, 2026. (Photo by Brendan SMIALOWSKI / AFP via Getty Images)

Double Preemption, Imminence, and the U.S. Attack Against Iran

Secretary of State Marco Rubio’s argument that Operation Epic Fury was an act of preemptive self-defense is not credible and does not satisfy the necessary precondition.
A man warms himself in front of a public fire pit at night.

Russia’s Big War at Four: Ukraine Keeps Fighting and Keeps Talking

Ukrainians have withstood the Russian onslaught and, thanks to Europe, have managed despite the reduction of U.S. military assistance. Trump has more he could offer.

Top Questions the Trump Administration Needs to Answer on War with Iran

What Congress, journalists, and the public should ask the Trump administration about its war in Iran.
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.
Under a hazy, grey sky, a convoy of white vehicles drives along a dusty road near Saraya Square in western Gaza City on Jan​. 19, 2025. The vehicles are marked with the the International Committee of the Red Cross' stickers and flags.

“Significantly Diminished”: Commenting Anew on Article 23 of Geneva Convention IV in a Transformed Legal Context

New Commentary on GC IV describes Article 23—the treaty’s key provision governing the duty to allow the passage of essentials to civilians—as "significantly diminished" today.
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.
Flags of USA and Iran

Top Experts’ Backgrounder: Military Action Against Iran and US Domestic Law

Experts who advised a president on use of force answer a full range of basic questions on the conditions under which action against Iran would be lawful, and what options Congress…
Two small children unload white bags off of a big white truck with a Red Crescent sign on the side, at dusk. A woman fully covered in a black chador stands next to the truck with her back to the camera.

Syria’s Al-Hol Camp Is Closed, But Another Remains, as Does International Responsibility

Responsible states can end the chaos and suffering in remaining camps like Roj by repatriating detainees and upholding their obligations to their citizens.
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.

Proving Genocide: Genocidal Intent and Other Aims

In Gambia v. Myanmar, genocidal intent coexists with other aims, revealed through conduct or official statements, showing how destruction of a group can serve broader goals.
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