Use of Force

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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)

Legal Issues Raised by a Lethal U.S. Military Attack in the Caribbean

The Trump administration’s extraordinary lethal attack on a purported drug smuggling vessel – and its vow that it is the start of a campaign – raise significant legal issues.
The Just Security Podcast

The Just Security Podcast: Is There a Diplomatic Path for Iran’s Nuclear Program? An Interview with Richard Nephew

Just Security’s Tess Bridgeman is joined by Richard Nephew to discuss where things stand and what a path forward for Iran's nuclear program might look like.
U.S. Ambassador to the United Nations Dorothy Camille Shea speaks during a Security Council Meeting on the Israel-Iran conflict at United Nations headquarters on June 24, 2025 in New York. (Photo by ANGELA WEISS/AFP via Getty Images)

Assessing the U.S. Article 51 Letter for the Attack on Iran: Legal Lipstick on the Use of Force Pig

Former State Department attorney analyzes U.S. letter to UN Security Council that presented legal arguments for U.S. strike on Iran's nuclear facilities.
Secretary Noem posts an Instagram reel on April 8, 2025 with the text message: "Human traffickers. Drug Smugglers. 18th Street Gang members. Spent the morning in Phoenix with our brave @icegov and Arizona law enforcement arresting these dirtbags and getting them off of our streets."

What are “Wartime Authorities” and When Can the President Use Them? An Expert Q&A

It is essential to understand the line between war and peace, scrutinize the application of wartime powers, and interrogate the president’s assertions when he triggers them.
This picture taken from a position in southern Israel, on the border with the Gaza Strip, shows destroyed buildings in the besieged territory on May 27, 2025. (Photo by JACK GUEZ/AFP via Getty Images) 

The Illegality of Israel’s Military Offensive in Gaza

Analysis of jus ad bellum with Israel’s stated objectives for its current military operations in Gaza.
U.S. Secretary of Defense Pete Hegseth talks with Panama Canal Administrator Ricaurte Vasquez in front of a Panama Canal sign.

Ambiguity Is Not Authorization: The Neutrality Treaty Does Not Justify U.S. Military Intervention in Panama

U.S. Military intervention in Panama would violate fundamental international norms and find no justification in the Neutrality Treaty.
U.S. President Donald Trump (C) and Vice President JD Vance meet with Ukrainian President Volodymyr Zelensky in the Oval Office at the White House on February 28, 2025 in Washington, DC.

Negotiations at Gunpoint: Does U.S. Pressure on Ukraine for a Minerals Deal Amount to Unlawfully Procuring a Treaty by Use of Force?

Coercion leveraged by the U.S. to secure Ukrainian mineral resources could be deemed use of force, rendering any resulting treaty void.
Sudan Marks Two Years of War podcast screenshot

The Just Security Podcast: Sudan Marks Two Years of War

Sudan marks two years of war this week. Where does the country and the international community trying to support it go from here?
Two soldiers walk past a destroyed building in Khartoum.

Two Years of War in Sudan: From Revolution to Ruin and the Fight to Rise Again

As Sudan marks two years of brutal war between the Sudanese army and the RSF, the country stands at a dangerous crossroads.
Satellite image of the orbit of ASAT debris from a China ASAT weapons test in 2022.

Balancing State Security and Peace and Security in Outer Space: What Role for International Law on the Use of Force?

Understanding jus ad bellum necessity and proportionality is crucial to addressing concerns regarding the weaponization of outer space.
A person wearing a Panamanian flag steps on a U.S. flag.

Upending the International Order: Why Undermining the UN Charter and US Defense Commitments is Self-Defeating

The President should understand that bellicose threats and unreliability as an ally may leave the United States poorer and more vulnerable on his watch and will frustrate his nuclear…
Kyiv buildings at night with explosions in the sky

The Voices from Kyiv: Is the World Legal Order in Decay?

The Russian invasion of Ukraine, and states’ reactions to it, are setting the stage for possible changes to the international legal order. In the end, this is a battle for a…
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