All 27 EU member states agreed on June 12, 2026 to begin formal accession negotiations with Ukraine and Moldova. The talks formally opened in Luxembourg on June 15, with EU leadership immediately discussing the move at their summit the following week.

This is not merely a symbolic gesture. The EU structures accession into steps. Ukraine received candidate status back in 2022, and formal talks began in 2024. But opening what's called "Cluster 1" is the actual start of the serious negotiation process — the moment when specific legal requirements kick in and a country must prove it can meet them.

What Is Cluster 1?

The EU has 35 major policy areas that any new member must align with before joining. These are grouped into six bundles, called clusters. Cluster 1 is the foundation: it covers rule of law (independent courts and judges), anti-corruption measures, fundamental rights, and public administration reform.

This cluster opens first and closes last. In other words, a country must show real progress on governance and fighting corruption before it can move on to negotiate rules about the economy, trade, or anything else. It's the gate that everything else passes through.

Ukraine's Wartime Challenge, Moldova's Fragility

For Ukraine, this is unprecedented. It must reform its courts, strengthen anti-corruption systems, and overhaul public institutions — all while fighting an active war. No candidate country has ever attempted this before.

Moldova faces a different problem. It is smaller and has weaker institutions. It also faces ongoing attempts by Russia to interfere in its politics, and it has an unresolved separatist region (Transnistria) that complicates its sovereignty.

Brussels decided to move both countries forward together rather than separately. Splitting them might have sent the wrong message to Chișinău or complicated the accession queue for other Eastern European countries waiting their turn.

The Bigger Picture: EU Growing Pains

Ukraine is enormous — the largest country ever to apply for EU membership by population and land area. Its agriculture sector alone would strain the EU's farm subsidy budget. Energy grids, labour markets, and money for regional development — each involves hundreds of billions of euros that the EU's current budget does not clearly account for.

Other countries are also pursuing EU membership: Montenegro by around 2028, and several Western Balkans nations at various stages. This has sparked debate in Brussels about whether the EU can actually handle absorbing so many large new members without changing how it makes decisions and spends money. Five EU countries have already proposed new rules to protect themselves once they are outnumbered.

The process ahead is not quick. Opening Cluster 1 is the starting gun, not the finish line. The real distance to accession runs through every one of the 27 member states' capitals, and that journey will take a decade or more — especially for Ukraine. Every country must ultimately agree, and each has its own interests: France's farm lobby, Hungary's foreign policy concerns, and many others. None of this is automatic.