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French President Macron (seated on left), European Commission President von der Leyen (standing center), and European Council President Antonio Costa (seated right) interact as three men stand behind them. Macron, his hands clasped at his chin, is listening to von der Leyen and Costa.

The Transatlantic Dilemma: How to Pursue Autonomy Without Foreclosing Future Cooperation

Transatlantic relations are unraveling as U.S.-Europe tensions deepen over Ukraine, Iran, and NATO, risking a long-term shift from cooperation to strategic rivalry.
(L-R) A general view of the capital Nuuk, Greenland, on March 4, 2025. US President Donald Trump has strained relations with Denmark by repeatedly signalling that he wants control over Greenland, an autonomous Danish territory. (Photo by ODD ANDERSEN/AFP via Getty Images); U.S. Secretary of State Marco Rubio listens as U.S. President Donald Trump addresses the media during a news conference at his Mar-a-Lago club on January 3, 2026, in Palm Beach, Florida. During the remarks, Trump confirmed that the U.S. military had carried out a large-scale strike in Caracas overnight, resulting in the capture of Venezuelan leader Nicolas Maduro and his wife, Cilia Flores.(Photo by Joe Raedle/Getty Images); A general view of the capital Nuuk, Greenland, on March 4, 2025. US President Donald Trump has strained relations with Denmark by repeatedly signalling that he wants control over Greenland, an autonomous Danish territory. (Photo by ODD ANDERSEN/AFP via Getty Images)

Collection: U.S., Greenland, and NATO

Experts examine legal, political, and security dimensions of U.S. policy on Greenland, including U.S.-NATO relations, congressional oversight, and geopolitical implications.  
People wave Iranian flags from the bed of a truck depicting Grand Ayatollah Ali Sistani

Is the United States at War with Iraq?

The non-international armed conflict between the Islamic Resistance in Iraq and the United States and Israel has yet to transform into an international armed conflict.

Lessons from the Pentagon’s Empty Case Against Mark Kelly

Expert on civil-military relations writes on what's behind Secretary Pete Hegseth’s "hollow pursuit" of Senator Mark Kelly.

The Just Security Podcast: Murder on the High Seas Part V

Tess Bridgeman and Rachel Goldbrenner are joined by Rebecca Ingber and Brian Finucane to examine escalating U.S. strikes on suspected drug traffickers.
In this picture obtained from Iran's ISNA news agency on May 4, 2026, the Iran-flagged tugboat Basim sails near a ship anchored in the Strait of Hormuz off Bandar Abbas in southern Iran. Iran's Revolutionary Guards on May 4 denied that any commercial ships had crossed the Strait of Hormuz, after the US military earlier said two US-flagged merchant vessels had transited through the vital waterway. (Photo by Amirhossein KHORGOOEI / ISNA / AFP via Getty Images) /

What the Iran War Reveals About the War Powers Resolution and How Congress Can Act

It is Congress’s responsibility to assert its constitutional prerogatives with respect to the use of force and to rein in a lawless executive.
Diploma, notebooks and soldier uniform near flag of United States (Getty Images - Liudmila Chernetska)

Hegseth’s Intellectual Purge is an Insult to His Officer Corps

"I am also a registered Republican and a gun owner. I did not arrive in Cambridge confused about my political identity. I did not leave with it erased or chastened."
A man stands in front of a window in daylight, reaching up to check equipment hanging from a ceiling over a gurney-like hospital bed in a damaged room of a maternity hospital. Shattered glass on the floor at the foot of the gurney reflects the light coming through the window.

How the Law of War Can Reckon with Longer-Term Harms of Attacks on Health

When war affects complex and interconnected civilian systems, the full measure of civilian harm lies in what comes after the blast.
Gen. Dan Caine speaks at a podium in front of a photograph of a ship

Five “Blockades” and One Legal Problem: Naval Enforcement in the U.S.–Iran Conflict

Former U.S. Navy Commander, JAGC Mark Nevitt clarifies the 5 "blockades" in the U.S.-Iran conflict and the different legal issues and operational risks at stake.
U.S. Secretary of Defense Pete Hegseth listens as Chairman of the Joint Chiefs of Staff Gen. Dan Caine testifies before the Senate Armed Services Committee in the Dirksen Senate Office Building on June 18, 2025 in Washington, DC.

At the 60-Day Mark, the Iran War is Triply Illegal

Under the War Powers Resolution, Trump must now terminate the hostilities against Iran he began two months ago. He seems set against doing so.
A detailed view of the uniform of a senior military member as U.S. President Donald Trump speaks at Marine Corps Base Quantico on September 30, 2025 in Quantico, Virginia.

Legal Foundations of Honorable Military Service

As former judge advocates, it was our responsibility while on active duty to advise on the legal demands of and limits on senior officers’ authority and responsibility.
A column of black smoke rises above buildings as traffic, mostly motorcycles, pass in the foreground.

Insurgent Offensive in Mali Exposes the Deficiencies of Junta-led Security in the Sahel

Recent militant attacks that killed Mali's defense minister challenge the proposition of the region's juntas that Russia could be a better security partner than the West.
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