• Moscow could accept Ukraine joining the EU if it forgoes NATO membership, according to U.S. officials.
  • EU accession talks with Ukraine are formally underway but face political hurdles, including opposition from Hungary.
  • The war continues to shape integration efforts, with debates over security guarantees and frozen Russian assets.

Russia has indicated it might be willing to tolerate Ukraine's membership in the European Union, provided Kyiv does not pursue entry into NATO, U.S. officials have conveyed. This stance frames EU enlargement as less of a direct security threat compared to NATO expansion, reflecting Moscow's long-standing red lines in European security architecture. The assessment comes as Ukraine's EU accession negotiations, formally opened in June 2024, progress slowly amid internal EU political obstacles and the ongoing conflict.

Efforts to advance Ukraine's EU integration have hit a snag, with Hungary blocking the opening of several accession chapters in June 2025, arguing that admitting a country at war risks "integrating war" into the bloc. According to people familiar with the matter, this opposition has stalled momentum, even as Ukraine's deputy prime minister for European and Euro-Atlantic integration presented a roadmap for accession earlier in 2025. EU leaders are simultaneously debating security guarantees and the potential use of frozen Russian sovereign assets to support Ukraine's defense and reconstruction, underscoring how financial and security dimensions are now tightly linked to enlargement talks.

"What institutional investors like us are really focused on is regulatory stability," said a source close to the negotiations, echoing broader concerns about the economic implications. Deeper EU integration would gradually tie Ukraine into the single market, potentially boosting trade and investment but requiring major reforms and reconstruction spending, estimated in the billions. The war has already led to large-scale EU financial support and trade reorientation, with Ukraine increasingly dependent on EU markets and aid, according to recent market data.

In a brief statement, a Ukrainian official emphasized that EU membership remains a "civilizational choice" for the country, with public support surging after the 2022 invasion. However, within the EU, there is debate over enlargement fatigue and fiscal burden-sharing, complicating the path forward. Attempts to reach Russian officials for comment were unsuccessful, but analysts note that this reported openness aligns with historical patterns where Moscow views EU expansion as a political challenge rather than a military threat.

Without a deal to unblock negotiations, Ukraine's accession could face significant delays, with some European leaders doubting membership before the mid-2030s due to institutional and budgetary constraints. The EU has also opened parallel talks with Moldova, highlighting a broader eastward enlargement dynamic. As of late 2025, real-time discussions focus on merit-based progress, with experts predicting slow, chapter-by-chapter negotiations and increased integration into EU structures like energy and defense-industrial cooperation, even before full membership is achieved.

Correction: An earlier version misstated the timing of Hungary's block on accession chapters; it occurred in June 2025, not 2024.