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.
Our pillars

Deterrence and defense in the Euro-Atlantic
Developing policy recommendations for deterring and defending against aggression aimed at allies and partners in the European theater.
Strategic competition
Assessing areas of strategic competition critical to transatlantic values and interests, such as the Russia-China partnership supporting Russia’s illegal war against Ukraine, and building collaboration with like-minded partners across the globe through bilateral and multilateral bodies.


Evolving threats and emerging capabilities
Creating strategies to harness emerging and disruptive technologies to maintain NATO’s competitive advantage and cohering a transatlantic approach to hybrid threats.
NATO programming

Amid a historic year for the Alliance, the Atlantic Council led the charge in shaping the agenda for the 2025 NATO Summit in The Hague, the Netherlands, informing the transatlantic community, and demonstrating NATO’s enduring value.
Take a look at our footprint on the ground in The Hague as we look to operationalize the Alliance’s commitments to fortifying Euro-Atlantic security.