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Complementarity or Competition? Franco-British Cooperation and the European Horizon of French Defense Policy

Studies
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Focus Stratégique
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Focus stratégique, No. 96 bis, April 2021
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What does future hold for the Franco-British defense partnership after Brexit?

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Paris, August 22, 2019 - President Macron welcoming PM Johnson
Paris, August 22, 2019 - President Macron welcoming PM Johnson
F. Legrand © Shutterstock
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France and the United Kingdom have, for long, enjoyed a close defense relationship, thanks in part to their analogous strategic cultures. The 2010 Lancaster House treaties built on this proximity to expand cooperation in the fields of nuclear weapons, force projection, interoperability and industrial integration. In spite of genuine progress in the first years following the treaties, the Franco-British strategic partnership has had to face two pitfalls: on the one hand, Brexit and its political consequences for the United Kingdom, and, on the other hand, President Macron’s attempt to revive European defense and Franco-German cooperation. The tenth anniversary of Lancaster House should offer the opportunity to rethink the convergence between bilateral cooperation and the resolutely European horizon of French defense policy.

This content is available in French: Complémentarité ou concurrence ? La coopération franco-britannique et l'horizon européen de la défense française.

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ISBN / ISSN

979-10-373-0347-9

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Complementarity or Competition? Franco-British Cooperation and the European Horizon of French Defense Policy

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Author(s)
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Alice PANNIER

Intitulé du poste

Former Associate Research Fellow, Former Head of Ifri's Center for Geopolitics of Technology, Ifri

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 A soldier watching a sunset on an armored infantry fighting vehicle
Security Studies Center
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Heir to a tradition dating back to the founding of Ifri, the Security Studies Center provides public and private decision-makers as well as the general public with the keys to understanding power relations and contemporary modes of conflict as well as those to come. Through its positioning at the juncture of politics and operations, the credibility of its civil-military team and the wide distribution of its publications in French and English, the Center for Security Studies constitutes in the French landscape of think tanks a unique center of research and influence on the national and international defense debate.

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Taking the Pulse: Enough with the Annual NATO Summits, Already?

Date de publication
16 July 2026
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Over the past ten years, NATO has held almost as many summits as it did during the entirety of the Cold War. Are they still useful, or is it time to stop holding annual meetings?

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How does France’s nuclear deterrent contribute to the defense of Europe?

Date de publication
10 July 2026
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France’s nuclear deterrent, serving first and foremost to defend France’s vital interests, also contributes to the defense of Europe. This contribution has been recognized within the North Atlantic Alliance since 1974, but remains little known. In a speech closely followed by France’s European partners and its adversaries alike, President Emmanuel Macron announced a new concept for French nuclear deterrence: “forward deterrence” (dissuasion avancée). This article aims to explain the origins of this concept, outline its main pillars, and describe the partnerships that are sought. It then discusses the relationship with the U.S. doctrine of “extended deterrence”, and finally offers some ethical considerations.

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Fury from the Skies. A Strategic Analysis of Air Campaign against Iran

Date de publication
07 May 2026
Accroche

What is the outcome of Operations Roaring Lion (RL) and Epic Fury (EF), launched by Israel and the United States against the Islamic Republic of Iran on February 28, 2026?

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Finland: The Ally Who Came in from the Cold

Date de publication
10 April 2026
Accroche

Among all European countries, Finland is perhaps the one whose strategic culture and military model have changed the least since the end of the Cold War. Built after the end of the Second World War to deter a potential new Soviet invasion, this model enabled Finland to serve as an example of European rearmament.

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Paris, August 22, 2019 - President Macron welcoming PM Johnson
F. Legrand © Shutterstock

How can this study be cited?

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Alice PANNIER, « Complementarity or Competition? Franco-British Cooperation and the European Horizon of French Defense Policy », Studies, Focus Stratégique, Ifri, 23 April 2021.
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Complementarity or Competition? Franco-British Cooperation and the European Horizon of French Defense Policy