Ukrainian President Volodymyr Zelensky holds a press conference in Brussels, Belgium, on May 20, 2025. Ukraine’s journey toward EU membership could change the union’s integration process. (Shutterstock/Photoibo)

Why Ukraine Is Key for Europe’s New Strategic Reality

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As Ukraine moves closer to European integration, the limits of the EU’s traditional enlargement model are becoming clear.

In 2026, Ukraine’s future in Europe is no longer simply a question about its integration into the European Union. It has become a strategic one. A series of debates about Europe’s defense, independence, and economy—topics that once seemed disconnected—are now increasingly interconnected. Discussions on speeding up Ukraine’s integration into EU institutions, proposals for its gradual inclusion in the EU’s Single Market, renewed interest in trans-European defense collaboration, and consultations among key European nations on Ukraine’s future reflect a significant shift in European perspectives.

For decades, enlargement stood out as one of the European Union’s most successful political initiatives. Beginning in 1951, the process of European integration gradually expanded, creating a more unified community of democracy, prosperity, and stability on a continent emerging from division and conflict. Candidate countries carried out reforms, bolstered institutions, and progressively integrated into the Union’s evolving political, economic, and social systems.

This took place within a strategic context in which the core issues of European security seemed largely resolved, thanks to NATO’s creation and expansion. Today, however, many of these assumptions are under question. Above all, Russia’s full-scale invasion of Ukraine has shattered the foundations of the post-Cold War European security framework. 

At the same time, growing uncertainty about the future of the transatlantic relationship has revived questions that Europeans thought were resolved long ago. Who bears responsibility for the continent’s security? How should deterrence be........

© The National Interest