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

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Focus Stratégique
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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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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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France has a new nuclear doctrine of ‘forward deterrence’ for Europe. What does it mean?

Date de publication
05 March 2026
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On Monday, French President Emmanuel Macron delivered a speech on France’s nuclear deterrence at the Île Longue naval base near Brest in Brittany, which hosts the country’s nuclear-armed ballistic missile submarines. Such addresses are a well-established presidential ritual, typically delivered once per presidential term and receiving moderate attention. This one, however, was highly anticipated in France and abroad, given the profound geopolitical shifts since Macron’s first nuclear speech in February 2020.

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Bundeswehr: From Zeitenwende (historic turning point) to Epochenbruch (epochal shift)

Date de publication
25 February 2026
Accroche

The Zeitenwende (historic turning point) announced by Olaf Scholz on February 27, 2022, is shifting into high gear. Financially supported by the March 2025 reform of Germany’s “debt break” and backed by a broad political and societal consensus to strengthen and modernize the Bundeswehr, Germany's military capabilities are set to rapidly increase over the coming years. Expected to assume a central role in the defense of the European continent in the context of changing transatlantic relations, Berlin’s military-political position on the continent is being radically transformed. 

Johanna MÖHRING
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Main Battle Tank: Obsolescence or Renaissance?

Date de publication
17 November 2025
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Since February 2022, Russian and Ukrainian forces combined have lost more than 5,000 battle tanks, a much higher volume than all the European armor combined. Spearhead of the Soviet doctrine from which the two belligerents came, tanks were deployed in large numbers from the first day and proved to be a prime target for UAVs that became more numerous and efficient over the months. The large number of UAV strike videos against tanks has also led a certain number of observers to conclude, once again, that armor is obsolete on a modern battlefield. This approach must, however, be nuanced by a deeper study of the losses and their origin, UAVs rarely being the sole origin of the loss itself, often caused by a combination of factors such as mines, artillery or other anti-tank weapons.

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Mapping the MilTech War: Eight Lessons from Ukraine’s Battlefield

Date de publication
12 February 2026
Accroche

This report maps out the evolution of key technologies that have emerged or developed in the last 4 years of the war in Ukraine. Its goal is to derive the lessons the North Atlantic Treaty Organization (NATO) could learn to strengthen its defensive capabilities and prepare for modern war, which is large-scale and conventional in nature.

Élie TENENBAUM Bohdan KOSTIUK Daryna-Maryna PATIUK Anastasya SHAPOCHKINA
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Paris, August 22, 2019 - President Macron welcoming PM Johnson
F. Legrand © Shutterstock

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