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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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Date de publication
11 September 2025
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Saudi Arabia’s integration in the international arena and regional stability, notably through reducing its dependence on fossil energies, are crucial elements for the success of the Kingdom’s Vision 2030, the Crown Prince’s top priority. However, Mohammed bin Salman’s declarations in 2018 and 2021, indicating that “if Iran develops a nuclear bomb, we will follow suit as soon as possible”, combined with the recent strikes on key Iranian nuclear facilities, do not bode well for the future of the Kingdom, the region and the non-proliferation regime at large.

Nour EID
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The Future of Air Superiority. Command of the Air in High Intensity Warfare

Date de publication
24 January 2025
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Air superiority, understood as control of the air, is a cornerstone of the Western art of warfare. It is a decisive condition, albeit not sufficient by itself, to achieve military victory, as it enables the concentration of air power toward the achievement of wider strategic objectives and protects other components from unbearable attrition levels. It is best achieved through the offensive use of air power in a joint effort to neutralize the enemy’s air power.

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Europe Uncovered?

Date de publication
09 September 2025
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As Russia continues to threaten Europe, the Trump administration is making no secret of its desire to withdraw—at least partially—from the defense of the Old
Continent in order to focus on strategic competition with China. It is thus putting pressure on its European allies to increase their investment in the military sector. The NATO Summit in The Hague in June 2025 resulted in ambitious commitments by member states to increase their defense spending.

Élie TENENBAUM Guillaume GARNIER
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How should Britain and France cooperate to realise the Northwood Declaration?

Date de publication
18 July 2025
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During his state visit to the United Kingdom (UK) last week, Emmanuel Macron, President of France, signed a joint declaration with Sir Keir Starmer, Prime Minister, on nuclear cooperation between Britain and France. The Northwood Declaration highlights that while both countries’ nuclear arsenals remain sovereign, cooperation on nuclear deterrence can ‘contribute significantly’ to the security of the North Atlantic Treaty Organisation (NATO) and the Euro-Atlantic region.

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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