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(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.  
A person enjoys an afternoon walk near the sea on January 15, 2026 in Nuuk, Greenland. (Photo by Alessandro RAMPAZZO / AFP via Getty Images)

How Congress Can Preserve NATO and Greenland: Using 22 USC 1928f to Protect the Peace

Trump’s threats to invade Greenland risk destroying NATO itself, but a little-known statute, 22 U.S.C. 1928f, could prevent him from doing just that.
NATO Leaders join King Willem-Alexander and Queen Máxima of the Netherlands for a family photo as they participate in the 2025 NATO summit on June 24, 2025 in The Hague, Netherlands. (Photo by Haiyun Jiang-Pool/Getty Images)

The North Atlantic Treaty and a U.S. Attack on Denmark

Would NATO have to defend Denmark if the United States attempted to seize Greenland? Article 5 suggests other allies are obligated to come to Denmark's defense if requested.

Congress, the President, and the Use of Military Force in Venezuela

Did the president have the authority under U.S. law to undertake Operation Absolute Resolve without congressional authorization? Leading experts say he did not.

Maduro Capture Operation and the President’s Duty to Faithfully Execute U.N. Charter

A decades-old Office of Legal Counsel memorandum claiming the President can disregard the UN Charter does not withstand serious scrutiny.
A U.S. Air Force A-10 Thunderbolt II taxis at a base in the U.S. Central Command area of responsibility, Dec. 19, 2025. (U.S. Air Force photo)

Operation Hawkeye Strike: Attacking ISIS in Syria and International Law

International law, the new Syrian government, and U.S. military strikes against ISIS
Two crude oil tankers

Blockading Venezuela: The International Law Consequences

Expert analysis of the announced U.S. military blockade of Venezuela
Industrial fishing nets that appear to be dark red in color, along with their white floats, are spread out across the bottom two-thirds of the image, with fishermen walking among them and seagulls flying overhead, against a backdrop of a large paved area where a few cards are driving in front of an array of white warehouse-like buildings in the background. (Photo by ABDEL MAJID BZIOUAT/AFP via Getty Images)

A U.S.-Russia-China Entente? The Unmaking of the Sovereignty System via the Western Sahara

U.N. Security Council Resolution 2797 endorses Morocco's Autonomy Plan for Western Sahara, normalizing domination in a U.S.-China-Russia tripolar order.
Belarusian President Alexander Lukashenko (L) shakes hands with Russian President Vladimir Putin (R) during the Great Heritage - Common Future Forum, a Russian-Belarusian meeting, dedicated to the anniversary of the Battle of Stalingrad on April 29, 2025 in Volgograd, Russia. Vladimir Putin and Alexander Lukashenko are having a joint visit to Volgograd, former Stalingrad, marking the 80th anniversary of the end of World War II. (Photo by Contributor/Getty Images)

Memorandum for Prosecution of the Crime of Aggression Committed Against Ukraine

James Goldston and Esti Tambay present their organization's work, a Memorandum supporting efforts to hold officials accountable for the crime of aggression against Ukraine.

The ICJ’s Advisory Opinion on Israel’s Obligations Towards UNRWA and Other International Organizations in the Occupied Territories: Key Issues

Unpacking the International Court of Justice's advisory opinion on Israel's obligations towards the UN and others to provide humanitarian aid in the West Bank and Gaza.
First Deputy Permanent Representative of Russia to the UN Dmitry Polyansky (R) speaks at a Security Council meeting on Ukraine at the United Nations in New York on September 23, 2025. (Photo by Kena Betancur / AFP) (Photo by KENA BETANCUR/AFP via Getty Images)

The United Nations in Hindsight: The Increasing Use of Article 51 of the UN Charter and the Security Council

Reports required under Article 51 are crucial for the UNSC to assess disputed self-defense claims and ensure accountability and maintain peace.
A NATO AWACS Tactical Director assesses the air and surface situation aboard an AWACS (Airborne Warning and Control System) NATO air surveillance aircraft during a flight over Polish airspace as part of the alliance's new Eastern Sentry mission on September 19, 2025. NATO said on September 19, 2025, it had scrambled aircraft to intercept Russian jets violating Estonian airspace, calling it proof of Moscow's "reckless" behaviour and the alliance's readiness to counter it. (Photo by JOHN THYS / AFP) (Photo by JOHN THYS/AFP via Getty Images)

Legally Available Options in Response to Russia’s Penetrations of NATO Airspace

"International law, in its wisdom, makes such options legally available."
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