Ukraine shifts from security consumer to provider as Europe rethinks defence architecture

For three decades the question dominating Europe's relationship with Ukraine was whether Kyiv would ever join the European Union. That debate has been overtaken by a more urgent one: whether Europe can credibly defend itself without Ukraine. The shift in framing reflects a material change on the ground. Since February 2022 Ukraine has not only withstood the largest land war in Europe since 1945 but has built the continent's most battle-hardened armed forces, a defence technology sector that iterates at speeds Western procurement systems cannot match, and a doctrine of warfare that is already rewriting military textbooks.

The argument, set out in a recent research paper for the Wilfried Martens Center for European Studies by Aliona Hlivco, founder of the St. James's Foreign Policy Group and a visiting lecturer at King's College London, is that Europe's future security architecture must be built around capabilities and contributions rather than institutional habits inherited from a different era. On that measure, Ukraine is becoming an indispensable contributor.

From consumer to net provider

The transformation is stark. In 2021 Ukraine was a recipient of European security guarantees, training missions and equipment donations. Today it fields a military that has conducted large-scale combined-arms operations, integrated unmanned systems at every echelon, and developed targeting cycles measured in minutes rather than hours. Ukrainian defence companies now produce everything from long-range strike drones to AI-enabled reconnaissance platforms, often iterating designs based on front-line feedback within weeks. Western defence ministries are studying these innovation loops, not the other way round.

This has practical consequences. European defence industrial programmes, from the European Defence Fund to the Permanent Structured Cooperation (PESCO) projects, are increasingly connected to Ukrainian firms. Kyiv has aligned its foreign and security policy with the Union to an unprecedented degree, effectively fulfilling the requirements of Cluster Six of the accession acquis, which covers external relations and common foreign and security policy. The formal label of membership has not caught up to the functional reality.

Germany pushes for phased integration

Berlin has recognised the gap. Chancellor Friedrich Merz has put forward a proposal for phased integration that would allow Ukraine to participate in key EU meetings and instruments, including the Foreign Affairs Council and relevant working groups, before the formal accession process concludes. The idea is not to substitute for membership but to accelerate the practical convergence that membership eventually delivers. Kyiv has been cautious, wary of any arrangement that could be portrayed as an alternative to full accession, but the logic of starting integration where it matters most, security and defence, is gaining traction in several capitals.

The political constraints are real. Upcoming elections in multiple member states, the requirement for national referendums in some, and the sheer complexity of the accession negotiations mean the formal timeline stretches years into the future. Security challenges, by contrast, do not wait for ratification procedures. Russia's aggression, instability across the southern neighbourhood, and uncertainty about the depth of American engagement on the continent have forced a rethink of how quickly Europe can operationalise its collective defence.

A European Defence Union takes shape

At the European Commission, Commissioner for Defence and Space Andrius Kubilius has advanced a more structural proposal: a European Defence Union governed by a European Security Council. The aim, he argues, is not to replace NATO but to strengthen the European pillar of the Alliance and finally give teeth to Article 42.7 of the Treaty on European Union, the mutual defence clause that has never been invoked in practice. A standing European Security Council would provide the political mechanism to activate collective defence commitments, coordinate capability development, and direct industrial policy, functions currently split across the Council, the Commission, and national capitals.

Ukraine, in this vision, is central from the outset. Any European security architecture that excludes the country with the continent's most experienced officer corps, the largest active land force, and a defence innovation ecosystem tested daily in high-intensity combat would be strategically incomplete. The debate in Brussels has already moved to practical questions: how Ukrainian officers can be embedded in European training commands, how Ukrainian doctrine can inform NATO's own concept development, and how the lessons of drone warfare, electronic warfare and rapid procurement can be institutionalised across the Union.

The Middle East model for European readiness

One model under discussion draws on the experience of Western militaries embedding partner forces in the Middle East. Even before the war ends, Ukrainian military professionals could be seconded to European training centres, staff colleges and operational headquarters to share lessons learned, develop joint doctrine, and stress-test European readiness assumptions. The value is not only tactical. Ukraine's officer corps has managed mobilisation, logistics, medical evacuation and civil-military integration at a scale no other European army has attempted since the Cold War. That organisational knowledge is a strategic asset that will outlast the current conflict.

Sceptics will point to the political risks. Integrating a non-member state into sensitive defence structures raises questions about classification, command authority, and the precedent it sets for other aspirant countries. There are also institutional jealousies: the European Defence Agency, the European External Action Service, and national defence ministries each guard their turf. But the alternative, waiting for the accession process to run its course while the security environment deteriorates, is increasingly seen as the greater risk.

Strategic autonomy meets strategic necessity

The broader context is Europe's collective reckoning with its own defence capacity. A decade ago the idea of a European Defence Commissioner, a continent-wide rearmament effort, or serious talk of strategic autonomy would have been dismissed as fantasy. Russia's full-scale invasion made all three realities. The European Defence Industrial Strategy, the ReArm Europe plan, and the creation of Kubilius's portfolio are evidence that the Union is moving from rhetoric to structure. What remains unresolved is whether the institutional architecture can keep pace with the strategic logic.

Ukraine's role in that architecture is no longer theoretical. It is already a net security provider, a defence industrial partner, and a doctrinal innovator. The remaining question is whether Europe has the political will to formalise that role before the next crisis forces its hand. The proposals from Merz and Kubilius represent two paths: incremental integration through existing EU instruments, and a new institutional framework designed for collective defence. They are not mutually exclusive. Both require Ukraine at the table.