For most of the post-Cold War period, European defence was a polite fiction.

The EU had defence policy frameworks, strategy documents, and institutional structures. It had a Common Security and Defence Policy, a European Defence Agency, a Military Committee, a Military Staff. It held summits at which leaders committed to spending more, cooperating more, and developing autonomous European military capacity.

And it had, underneath all of this, a fundamental political reality: NATO existed, the Americans paid for it, and European governments had concluded that maintaining large conventional military forces was expensive, domestically unpopular, and unnecessary.

Russia's full-scale invasion of Ukraine on February 24, 2022, ended that calculation. Not immediately — the first months of the invasion still produced the familiar European pattern of cautious support, calibrated escalation management, and deference to American leadership. But over the following two years, the combination of sustained Russian military aggression, growing uncertainty about American commitment to European security, and the sheer scale of what Ukraine required to defend itself produced a transformation in European defence thinking that would have been unimaginable a decade earlier.

The European Defence Union is being built in real time. Understanding what it is — and what it is not — requires understanding where it came from and what the structural constraints on its development remain.

The European Union's defence institutional framework was created by the Lisbon Treaty and has been elaborated since through a series of initiatives with acronyms that obscure their significance.

The Common Security and Defence Policy provides the legal basis for EU military and civilian missions. Under CSDP, the EU has deployed forces and civilian missions across Africa, the Middle East, and Europe — training missions in Mali and Somalia, naval operations in the Mediterranean and the Indian Ocean, monitoring missions in Georgia and Moldova, a military advisory mission in Ukraine.

The European Defence Agency, established in 2004, coordinates defence capability development across member states, manages research programmes, and facilitates joint procurement. Its budget and authority have historically been limited by member state reluctance to share defence industrial information and by the preference of larger member states for bilateral cooperation over EU-level coordination.

PESCO — Permanent Structured Cooperation — was activated in 2017, grouping member states willing to make more binding commitments to defence cooperation into a framework for joint capability development. Twenty-six of twenty-seven member states participate. The projects vary from genuinely significant — cyber defence, special operations forces training, military mobility — to modest demonstrations of cooperation.

The European Defence Fund, established in 2021 with a €7.9 billion budget for 2021-2027, provides EU funding for defence research and capability development. It is the most significant structural change in European defence institutional architecture — for the first time, the EU budget is financing military research and development.

The invasion of Ukraine did not create European defence cooperation — it accelerated it dramatically and changed its political context.

Germany's Zeitenwende — the "turning point" announced by Chancellor Scholz three days after the invasion — was the most symbolically significant change. Germany committed to increasing defence spending to 2 percent of GDP, created a €100 billion special fund for the Bundeswehr, and began reversing decades of policy that had kept German defence spending low and German arms exports to conflict zones restricted.

Across Europe, defence budgets rose. Poland committed to spending 4 percent of GDP on defence — the highest in NATO. The Nordic countries, which had been reducing defence spending for decades, reversed course sharply. Sweden and Finland, which had maintained military non-alignment for generations, applied for and joined NATO.

The EU's own response included the European Peace Facility — technically outside the EU budget due to treaty constraints on military financing — which has channelled billions of euros of military assistance to Ukraine, including weapons systems, ammunition, and training. It also included the Act in Support of Ammunition Production, which mobilised EU industrial capacity to address the ammunition shortages that emerged in the war's second year.

European Defence: Key Figures (2026)

EU member states meeting NATO 2% GDP target: approximately 20 of 27
European Defence Fund budget 2021-2027: €7.9 billion
European Peace Facility commitments to Ukraine: over €12 billion
PESCO projects: 68 active projects across capability areas
EU military missions and operations: approximately 20 active
Combined EU member state defence spending: approximately €350 billion annually
Largest spenders: Germany, France, Italy, Poland, Netherlands

The transformation in European defence spending and ambition is real. The structural limitations remain significant.

The EU cannot deploy forces for collective defence. Article 5 of the NATO treaty — the collective defence guarantee — has no equivalent in EU law. The EU's Mutual Assistance Clause (Article 42.7 of the Treaty on European Union) exists but has never been operationalised in the way Article 5 has. European defence ultimately rests on NATO, and NATO ultimately rests on American commitment.

European defence industries remain fragmented. Each major European country has maintained its own defence industrial base — France's Thales and MBDA, Germany's Rheinmetall and Hensoldt, Italy's Leonardo, Sweden's Saab. This fragmentation has historical and industrial policy rationales, but it produces inefficiency: multiple countries developing similar systems, limited economies of scale, and export rules that prevent the kind of rapid coalition-building that emergency procurement requires.

The ammunition crisis revealed by Ukraine's war exposed how far European defence industries had de-prioritised production capacity. Rebuilding that capacity requires both investment and time — neither of which is available in the quantities that the current security environment demands.

The concept of European strategic autonomy — the ability to act independently in security matters without depending on American decision-making — has become central to European defence debates since 2016 and has intensified since 2022.

The concept is genuinely contested within Europe. France, which has the EU's only independent nuclear deterrent and a tradition of Gaullist strategic independence, is its most consistent advocate. Eastern European members — Poland, the Baltic states, Romania — are deeply sceptical, arguing that weakening NATO integration in favour of European autonomy risks reducing rather than enhancing security.

The practical reality is somewhere between these positions. Europe needs to be able to do more without American support — not because American support is unreliable, but because the security environment is complex enough that American attention and resources will not always be available at European request. Building European capacity is not an alternative to NATO. It is an insurance policy.

How much insurance Europe is willing to pay for — and who pays what — is the question that will define European defence politics for the next decade.

European defence is being rebuilt after three decades of neglect — but the architecture being built is a complement to NATO, not a replacement for it, and the gap between ambition and capability remains significant.

Friday's EuroTasteDaily Review examines what Europe's rearmament actually means in practice — for defence industries, for NATO, for the transatlantic relationship, and for the strategic calculations of the countries that Europe is rearming against.