In recent months, several EU officials have said that the bloc is exploring ways to expedite Ukraine's accession, with some suggesting that Kyiv could join the European Union as early as 2027. Ukrainian President Volodymyr Zelensky has echoed this optimism, stating that Ukraine would be ready by then. Ukraine formally became an EU candidate in June 2022, shortly after Russia's full-scale invasion in February of that year. While EU accession is a lengthy and technically complex process (requiring compliance with extensive criteria grouped into six policy "clusters"), the European Commission stated in December 2025 that Ukraine had made significant progress across multiple areas. Still, with the war ongoing and Ukraine lagging on issues such as anti-corruption efforts and judicial reform, EU officials have increasingly argued that alternative pathways to membership should be explored. These include proposals for a phased or sequential accession, under which Ukraine would join the European Union in stages rather than through the current all-or-nothing framework. While these initiatives will enable closer EU-Ukraine cooperation in the coming years, the prospect of full, or even phased, membership will face numerous obstacles.
The Strategic Imperative: Locking in the West
There are many reasons why the European Union wants Ukraine to become a member. At its core, accession would lock in Ukraine's Western alignment while weakening Russia's ability to project power westward. EU membership would embed Ukraine in the bloc's legal and economic structures, boosting investment attractiveness and living standards while reducing social, political and economic instability along the European Union eastern border — vulnerabilities that Russia could otherwise exploit. In this respect, Ukraine's accession would mirror that of former Soviet states such as Latvia, Lithuania and Estonia. Ukraine would also bring modest economic benefits, strengthening EU food security and export capacity as an agricultural powerhouse, contributing critical raw materials essential to the green transition and defense sector, and potentially integrating into EU manufacturing supply chains over time (especially on defense), much as Central and Eastern European states did in the mid-2000s. There is a credibility dimension as well: the European Union has invested vast financial resources and political capital in Ukraine's survival as a sovereign state, and retreating now would undermine its standing as a geopolitical actor and weaken its leverage in the eastern neighborhood. A credible promise of accession is also meant to encourage private companies to invest in Ukraine's reconstruction by signaling that Ukraine will not be a dysfunctional state after the war.
At the same time, there are major obstacles to Ukraine's membership. The most immediate is that the war is still ongoing, and it is extremely unlikely that the European Union would accept a country currently fighting Russia. Even if hostilities were to end, much would depend on the nature of the settlement. A simple ceasefire, where fighting stops without resolving underlying disputes, would not be conducive to accession, as it would likely leave territorial and security issues unresolved. Cyprus's accession proved that the European Union is legally capable of admitting a divided country. But in doing so, the bloc also absorbed a territorial dispute with Turkey. Brussels is extremely wary of "internalizing" a hot or frozen conflict with Russia, which would be much more volatile than the situation in the eastern Mediterranean. A comprehensive peace agreement addressing territorial control and security guarantees would improve Ukraine's prospects, but many EU member states would still hesitate to admit a country that could face renewed Russian aggression in the medium or long term. The European Union's mutual defense clause, which obliges members to assist a state under attack, makes most governments unwilling to risk triggering collective defense obligations over Ukraine.
Even under a peace agreement that Europe considers robust and sustainable, Ukraine would still face challenges related to corruption, judicial independence and the influence of politicians and oligarchs over the economy and democratic institutions. Brussels is concerned that Ukraine's commitment to reforms might fade after accession, even if the country is willing and able to implement reforms beforehand, as seen in cases like Hungary. Wealthier EU states also worry about the budgetary impact of absorbing a comparatively poor country with a large population that would require long-term financial support, while poorer member states fear a redirection of cohesion funds and agricultural subsidies. Influential farmer groups in countries such as France, Poland, Romania and Spain already protest Ukrainian imports, and opposition would likely intensify as membership appears more imminent.
There are also broader political considerations. Many EU governments believe the bloc has already become too large and difficult to govern and that further enlargement would exacerbate institutional dysfunction. Internal EU reform, they argue, should precede any new accessions. This helps explain why enlargement has slowed significantly in recent years, with Croatia being the last country to join more than a decade ago. The current political climate further complicates matters: far-right parties have gained ground across Europe on strongly anti-immigration platforms, pushing even centrist governments toward tougher rhetoric. Accepting Ukraine (a populous country with lower living standards) would be politically difficult in states that fear a surge in Ukrainian migration after accession. Finally, bilateral political disputes matter. Accession decisions require unanimity among EU member states, and Hungary has emerged as a key opponent due to historical grievances, ideological positioning and personal hostility between its president, Viktor Orban, and Zelensky. Even if Hungary's ruling party were to lose power in the upcoming general election in April, and even as Brussels constantly seeks legal workarounds to the unanimity rule, other member states could still push to slow the process for political or economic reasons.
Integration in Stages?
These constraints explain why the European Union is increasingly assessing a sequenced accession model that departs from the traditional framework. Under such an approach, Ukraine could gain progressive access to parts of the EU single market before full membership. This would build on existing arrangements under the 2017 EU-Ukraine Association Agreement, which already allows partial free movement of goods. Ukraine could also be more fully included in EU programs such as Erasmus and in defense-industrial initiatives like SAFE. However, politically sensitive elements, such as free movement of labor, full access to agricultural subsidies and cohesion funds, would likely be excluded initially and deferred. The European Union would also be unlikely to grant Ukraine voting rights in decision-making bodies, leaving Kyiv outside the European Council, the European Parliament and the European Commission.
In theory, this approach would enable Ukraine to move closer to the European Union without requiring treaty reform (though some scholars dispute this), a politically fraught process few member states are willing to reopen. It would also reduce immediate fiscal and political costs by softening redistribution shocks tied to cohesion and agricultural spending. At the same time, it would preserve EU leverage by keeping reform incentives intact, as backsliding could be punished by slowing or reversing integration. This model could maintain EU credibility while avoiding immediate institutional change, and could serve as a template for other candidates such as Serbia, Albania and Moldova. It could also make politically difficult compromises to end the war, such as making territorial concessions to Russia, more palatable domestically in Ukraine if tied to deeper EU integration. In fact, Ukraine's right to EU membership is included in the most recent versions of the security guarantees that Kyiv has discussed with the White House.
Yet a sequential approach carries serious risks. Partial integration could trap Ukraine in permanent limbo, with early progress giving way to apathy in both Brussels and Kyiv and leaving the country stuck in a state of semi-membership. Over time, this could generate domestic backlash, as Ukrainians experience economic integration without political representation, reinforcing perceptions of second-class status. Such dynamics could reshape Ukrainian politics, with some parties campaigning to reclaim sovereignty and halt what they see as externally imposed, non-beneficial reform efforts. Within the European Union, critics may argue that sequential accession undermines the purpose of enlargement by granting benefits before full compliance, while others would warn that "half-members" further complicate the management of already strained institutions.
The Risk of the Gray Zone
Despite these debates, the core obstacle remains unchanged. Without a resolution to the war that Europe views as satisfactory and sustainable, Ukraine is unlikely to become a full EU member. Even innovative approaches like sequential accession will remain problematic while the conflict continues, and likely even in the event of a ceasefire or an inconclusive peace. Having invested heavily in Ukraine, the European Union will continue to provide financial and political support and remain committed to Kyiv's Western orientation. However, both full and partial membership are improbable during active conflict and unlikely in the immediate post-settlement period.
As a result, Ukraine will likely remain a front-line EU partner rather than a member in the short to medium term. While post-war reconstruction and continued EU financial support would boost economic activity, Ukraine's persistent gray-zone status would keep investment risks elevated and political volatility high. For Russia, this outcome would amount to a partial victory. A permanently Western-aligned Ukraine (even outside the European Union) would represent a strategic defeat for Moscow, as would failure to control Kyiv. However, the Kremlin would succeed in prolonging uncertainty over Ukraine's future and in demonstrating that sustained military pressure can freeze the European Union's foreign policy ambitions, thereby constraining Kyiv's sovereignty, leaving Ukraine vulnerable to renewed Russian destabilization efforts, and weakening Brussels' credibility as a security and political anchor in contested regions.
