About

The Transatlantic Security Initiative’s mission is to contribute to a strong and resilient transatlantic relationship that is prepared to deter and defend, succeed in strategic competition, and harness emerging capabilities to address future threats and opportunities. This mission endures across changing political dynamics on both sides of the Atlantic and in the face of new and evolving threats.

TSI advances the interests and values of the United States and its transatlantic allies and partners through the Atlantic Council’s convening power, our cutting-edge research and substantive expertise, and through our extensive and influential network across the transatlantic community. We work in partnership with governments, the private sector, think tank community, academia and others. We hold expert public and private convenings, conduct research, organize study trips, and produce publications, commentary and analysis to shape and influence policy and debate on the biggest challenges facing the transatlantic relationship. Intellectual independence is a cornerstone of our work at all times.

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The Scowcroft Center for Strategy and Security works to develop sustainable, nonpartisan strategies to address the most important security challenges facing the United States and the world.

Content

In the News

Jun 23, 2025

Deni and Arick in Stars and Stripes on NATO’s defense investment pledge

By Ryan Arick, John R. Deni

On June 23, Transatlantic Security Initiative nonresident senior fellow John Deni and associate director Ryan Arick were quoted in Stars and Stripes on NATO’s new defense investment pledge and how the Alliance should consider new expenditures related to defense and security.

Trackers and Data Visualizations

Jun 20, 2025

NATO Defense Spending Tracker

By Kristen Taylor

The Transatlantic Security Initiative's NATO defense spending tracker delves into data and figures to analyze current defense spending trends.

Europe & Eurasia NATO

New Atlanticist

Jun 20, 2025

What counts as ‘defense’ in NATO’s potential 5 percent spending goal?

By John R. Deni, Ryan Arick

The Alliance must ensure that “defense related” items truly contribute to collective defense as it plans its new, larger spending goal.

Defense Policy Europe & Eurasia

Issue Brief

Jun 5, 2025

Immediate steps that Europe can take to enhance its role in NATO defense

By Franklin D. Kramer, Kristen Taylor

As NATO members gather in the Hague amid uncertainty about US commitment to the continent and concerns about Russia’s military rebuilding, what can European nations do to deter and, if necessary, defeat threats from Moscow?

Europe & Eurasia NATO

New Atlanticist

Jun 5, 2025

What explains the transatlantic rift? It’s all about threat perception.

By Jason Davidson

NATO allies’ differing threat perceptions provide the backdrop for what could be a contentious summit in The Hague this month.

Defense Industry Defense Policy

Issue Brief

Jun 5, 2025

The world needs a maritime ‘elite league’ to combat rogue shipping

By Elisabeth Braw

The International Maritime Organization was created to address ocean safety. As member states have begun to erode and undermine the organization, there is need for coalitions of the willing or a maritime "elite league' to come together and enforce stricter enforcement of international maritime rules and regulations.

Economy & Business International Organizations

New Atlanticist

Jun 4, 2025

The UK Strategic Defence Review lays out an ambitious roadmap for reform. Will the government deliver?

By AM Sir Christopher Harper, KBE, RAF (Ret.)

The review is a positive step toward revitalizing the United Kingdom’s defense posture, but its success will depend on funding and follow-through.

Conflict Defense Industry
British Army soldiers during Steadfast Dart 25, the Allied Reaction Force’s first large-scale exercise, in Romania on February 17, 2025. North Atlantic Treaty Organization (NATO)/Flickr, https://www.flickr.com/photos/nato/54354207050/in/album-72177720324100561.

Issue Brief

Jun 2, 2025

For NATO in 2027, European leadership will be key to deterrence against Russia

By Scott Lee, Andrew Michta, Peter Jones, and Lisa Bembenick

NATO lacks the operational integration, logistics, and joint force capabilities needed to quickly counter Russian mass and tempo near its borders. With the United States increasingly focused elsewhere, how can the Alliance retain military superiority in 2027 without overreliance on US military might?

Defense Policy Europe & Eurasia

New Atlanticist

May 30, 2025

How NATO’s eastern flank is setting the standard for collective defense

By Justina Budginaite-Froehly

NATO's eastern flank countries have shown that regional coordination can transform vulnerabilities into strategic assets that enhance deterrence and operational readiness.

Central Europe Defense Industry

Issue Brief

May 30, 2025

The frontier is the front line: On climate resilience for infrastructure and supplies in Canada’s Arctic

By Jeffrey Reynolds, Kristen Taylor

The front lines of strategic competition now run through the Arctic. Ottawa must do more to enhance its military readiness and infrastructure preparedness in the region.

Climate Change & Climate Action Defense Policy