Britain’s Strategic Advantage in European Security

The repeated violations of NATO airspace by Russian military aircraft and drones over recent weeks represent more than isolated provocations. In September 2025, three armed Russian MiG-31 aircraft violated Estonian airspace for over ten minutes, activating NATO air defences. Romania, Finland, Lithuania, Norway, and Latvia have also reported Russian drone incursions, part of what NATO has described as a wider pattern of increasing provocations along the alliance’s eastern flank. Most recently, an unmanned, unidentified aircraft forced Danish airports to close.

These incursions signal a fundamental shift in European security dynamics, one that demands urgent leadership on the continent. As the United States retreats from its traditional, post-war role as Europe’s primary security guarantor, Europe’s need for stronger security integration grows more desperate. Britain can help fill this gap.

The Post-Brexit Defence Paradox

While EU membership debates once consumed British-European relations, the continent’s security architecture now operates on an entirely different axis. In the tension of the current climate, the need for defence cooperation has transcended past disputes over trade agreements and regulatory frameworks.

The May 2025 EU-UK Security and Defence Partnership represents the formal recognition of this reality. The partnership facilitates regular high-level dialogue and strategic consultations, with the possibility for UK participation in specific EU defence initiatives. More significantly, EU High Representative Kaja Kallas acknowledged that “the EU and UK clearly see eye-to-eye on so many levels” regarding Ukraine’s security and collective European defence. This framework encompasses maritime security, space security, cyber defence, hybrid threats, and crisis management—the full spectrum of twenty-first-century security challenges.

This partnership arrives as Europe confronts its most serious security threat since the end of the Cold War. Yet, the agreement remains non-binding and is built on voluntary cooperation rather than treaty obligations. This flexibility gives Britain something Brussels cannot easily replicate: the ability to lead without the EU’s institutional paralysis.

Leadership in security affairs demands credibility, and credibility requires investment. Here too, Britain possesses an edge. The Labour government committed in February 2025 to spend 2.5% of GDP on defence by 2027 and indicated plans to further increase spending to 3% in the next Parliament. This trajectory would position Britain well ahead of most European allies at a moment when NATO allies have committed to investing 5% of GDP annually on core defence requirements, but only by 2035.

While all NATO allies are expected to meet the 2% threshold by the end of 2025, merely meeting the minimum demonstrates participation, not leadership. Britain’s consistent commitment to exceeding NATO targets, combined with its nuclear capability, permanent seat on the UN Security Council, and global military footprint, creates a firm foundation for its continental leadership.

The American Withdrawal

American security guarantees have supported European defence for seventy-five years, but that era is coming to a close. President Trump’s repeated threats to withdraw from NATO, combined with America’s strategic pivot toward the Indo-Pacific, signal a fundamental reorientation. China’s military modernisation and tensions over Taiwan now dominate the bulk of American strategic planning. This reflects a genuine shift in where Washington perceives its key interests to lie. The war in Ukraine has exposed European dependence on American military enablers, from intelligence assets to precision munitions, while simultaneously demonstrating that Washington’s attention lies elsewhere.

American domestic politics have also grown increasingly sceptical of overseas commitments. Decades of expensive interventions in the Middle East and Afghanistan have created a war-weary electorate that questions the value of defending wealthy European allies who have underinvested in their own security. This sentiment exists across party lines. Europe must prepare for a future where American military support cannot be assumed, for that future is arriving faster than most European capitals acknowledge. The assumptions that Article 5 guarantees were automatic and that American forces would remain permanently stationed across the continent no longer hold.

This creates an urgent vacuum. The EU’s institutional structures were never designed to provide hard security leadership. Brussels excels at regulation, economic coordination, and diplomatic consensus-building, but defence requires speed, decisiveness, and the integration of intelligence, military, and political capabilities. These are national competencies, and they need a nation willing to lead.

Germany, despite its economic power, remains constrained by historical reluctance toward military assertiveness and decades of underinvestment in its armed forces—although it is increasing its defence spending to reach 3.5% by 2029. France possesses military capability but lacks the transoceanic credibility that Britain maintains through its Five Eyes intelligence sharing and historical role in NATO’s integrated command structure. Smaller European powers, meanwhile, regardless of their per capita contributions, cannot provide the scale of capability or diplomatic weight necessary for continental leadership.

Of these, the most serious challenge to British leadership comes from Germany’s defence transformation. If Germany fulfils its commitment to spend 3.5% of GDP by 2029, it will have the largest defence budget in Western and Central Europe by a considerable margin. Germany’s Zeitenwende represents a genuine strategic shift, even if implementation remains incomplete. Britain cannot compete with Germany in terms of spending volume, and attempting to do so would be foolish.

Defence leadership, however, depends on more than budget size. Germany faces structural challenges that spending cannot immediately overcome: decades of procurement dysfunction, an underdeveloped defence industrial base, limited expeditionary experience, and a strategic culture still adjusting to military assertiveness. More fundamentally, Germany lacks the intelligence infrastructure, nuclear deterrent, and operational relationships that Britain has maintained through continuous engagement with NATO and its other Western allies. Even a well-funded German military will take years, perhaps a decade, to develop the institutional memory that the British armed forces have retained. Therefore, the question becomes whether Britain can provide the immediate leadership Europe needs while Germany—and other neighbours—build capacity. This can be presented as complementary timing rather than intra-European competition.

Britain, by contrast, combines military effectiveness with political credibility on both sides of the Atlantic. Britain is European enough to understand continental security concerns and Atlanticist enough to maintain American confidence. This positioning represents Britain’s strategic advantage.

Britain’s response to Russia’s invasion of Ukraine demonstrates the kind of security leadership Europe needs. Since 2014, Britain has trained over 52,000 Ukrainian troops through Operation Orbital, provided critical intelligence sharing, and delivered sophisticated weapons systems, including Storm Shadow cruise missiles, Challenger 2 tanks, and air defence capabilities. When Russia launched its full-scale invasion in February 2022, Britain was among the first to supply aid to Ukraine and the first significant European power to provide main battle tanks.

Beyond the European Union

EU non-membership may, in fact, turn out to be an asset rather than a liability for British defence leadership. NATO demonstrates that defence cooperation can function effectively as an intergovernmental alliance without requiring institutional integration, as it operates efficiently with its current structure. The EU-UK Security and Defence Partnership follows this cooperative model.

Britain outside the EU can build its defence relationships based on military necessity without getting bogged down in institutional bloc politics. Britain can work bilaterally with Poland and the Baltic states on eastern flank security, partner with France on nuclear deterrence and expeditionary operations, support Nordic countries on Arctic and Baltic security, and maintain Mediterranean cooperation through its bases in Gibraltar and Cyprus.

The Nordic dimension of this cooperation deserves particular attention. Sweden and Finland’s accession to NATO in 2023 and 2024 fundamentally altered the Baltic security equation, transforming what was once NATO’s most vulnerable frontier into a zone of considerable defensive strength. The Nordic countries bring specialised Arctic warfare capabilities, advanced defence industries, and a combined military force that now makes the Baltic Sea nigh a NATO lake. Britain’s role amplifies this Nordic-Baltic integration as British forces can provide the nuclear umbrella and power projection capabilities that complement Nordic territorial defence strengths. The Joint Expeditionary Force, led by Britain alongside the Nordic and Baltic states, exemplifies this partnership model. British enabling capabilities, including carrier strike groups, amphibious forces, and long-range strike assets, are combined with Nordic expertise in cold-weather warfare and Baltic littoral operations. This coalition leadership reflects the kind of security architecture Europe actually needs.

Britain’s maritime advantage represents the most tangible contribution to continental defence. The Royal Navy’s continuous presence in the GIUK gap—the chokepoint between Greenland, Iceland, and the United Kingdom—enables the monitoring of Russian submarine movements from Arctic bases into the Atlantic, a capability that no other European nation can replicate on a similar scale. Meanwhile, in the Mediterranean, the British sovereign bases in Cyprus and Gibraltar provide a permanent forward presence for intelligence gathering, maritime patrols, and power projection in a region increasingly contested by Russian naval forces operating from Syria.

What Comes Next

The UK-EU Security and Defence Partnership arrives at a strategic time amid Russia’s war of aggression against Ukraine and growing geopolitical instability within Europe. The European continent faces coordinated hybrid threats, from cyberattacks to disinformation campaigns, alongside conventional military provocations. No single European nation can address these challenges alone, but equally, nor can any committee in Brussels provide the speed and decisiveness required.

Critics will argue that Britain lacks the economic power for such leadership or that Brexit has crippled its influence. This first objection misunderstands what security leadership requires: Britain does not need to outspend Germany or match France’s defence industrial capacity. Instead, Britain needs to maintain credible military capabilities, demonstrate its political will to lead, and integrate effectively with its European partners. The second objection is contradicted by the EU-UK Security and Defence Partnership itself, which indicates that European nations continue to recognise Britain’s security value even after Brexit.

A serious critique would be to question whether Britain can sustain this commitment. Defence spending pledges are politically vulnerable, military readiness faces genuine challenges, and Britain’s economic constraints are real. True, lasting leadership is only earned through consistent action and reliable partnership. Britain must prove, year after year, that it will deploy capable forces, provide actionable intelligence, and muster the political courage to act when others hesitate.

Europe is a continent with multiple potential capable security providers; these countries must come together and play to their strengths to counter the threats from an aggressive Russia and an ascendant China. Such a Europe would necessarily include a remilitarised Germany, a nuclear-armed France, an integrated Nordic-Baltic front, and a Poland committed to defending its eastern flank. Britain’s role in the picture involves acting quickly to further integrate coalition operations and maintain the transatlantic special relationship. At the same time, European institutional and military capacity can develop safely and with confidence.

To this end, Pickthall House recommends the following actions:

1. Establish a Permanent UK-Nordic-Baltic Joint Task Force: Transform the Joint Expeditionary Force coalition into a standing multinational headquarters with rotating command, integrated intelligence sharing, and pre-positioned equipment in the Baltic region. Combine British carrier strike capabilities with Nordic cold-weather expertise and Baltic territorial defence through quarterly exercises and continuous readiness protocols.
2. Create a European Defence Technology Partnership: Launch a UK-led initiative on emerging defence technologies (autonomous systems, cyber defence, and space-based surveillance) that accelerates procurement, shares development costs, and creates interoperable systems without EU institutional integration. Prioritise hybrid threats, including drones, cyberattacks, and disinformation.
3. Expand Operation Orbital into a Continent-Wide Military Training Hub: Transform Britain’s Ukrainian forces training programme into a permanent European military training centre offering specialised courses in modern warfare tactics, intelligence integration, and coalition operations. Focus on countries still developing military capacity while building standardised capabilities across the continent.