BRUSSELS — Montenegro as the EU’s 28th member by 2028? Not so fast, says Croatia, the bloc’s most recent member.

Ahead of a debate on enlargement among EU leaders at Thursday’s summit, Croatia — which joined the bloc in 2013 — is among the countries raising concerns about Montenegro’s accession bid.

Speaking to POLITICO at a pre-summit meeting of the European People’s Party, Croatian Prime Minister Andrej Plenković said Zagreb had been “extremely constructive” but pointed to unresolved issues under negotiating Chapter 23 (Judiciary and Fundamental Rights) and Chapter 31 (Foreign, Security and Defence Policy), some of which date back decades.

“Some have been on the agenda for the last two years [with] no progress whatsoever,” he said, urging Montenegro to make headway. “We will ask our colleagues to help them to make progress, if there’s an objective to conclude the negotiations.”

Croatia’s concerns are laid out in an orientation paper, obtained by POLITICO, in which Zagreb insists it supports Montenegro’s EU membership ambitions while identifying several outstanding disputes that need to be resolved.

“Croatia seeks to facilitate Montenegro’s accession, not obstruct it,” the paper reads. Several of the unresolved issues stem from Montenegro’s involvement in the military aggression against Croatia in the 1990s, including attacks on Dubrovnik and the occupation of parts of Croatian territory, according to the document.

Among Zagreb’s demands is compensation for Croatian nationals detained at the Morinj camp, where more than 300 Croatians were held between October 1991 and August 1992, following the occupation of part of the Dubrovnik region by Serbian and Montenegrin forces.

Croatia is also calling for the preservation and permanent display of a memorial plaque at the former detention camp, as well as the renaming of a municipal swimming pool in Kotor dedicated to Zoran Gopčević, a former international water polo player who, according to the document, served as a guard at Morinj in 1991 and 1992.

Other outstanding demands include the prosecution of war crimes committed during Croatia’s War of Independence and further talks on the delimitation of the border between the two countries.

Despite those disputes, Croatia has so far consented to Montenegro’s progress in accession negotiations. The country has provisionally closed 21 of its 33 negotiating chapters, making it the frontrunner in the EU’s enlargement process.

BRUSSELS — European leaders came for the budget. They’re staying for everything else.

A two-day European Council starting Thursday was supposed to be all about the money. Instead, leaders of the 27 EU member countries are heading into one of their most crowded summits in years, with a succession of geopolitical crises threatening to hijack the EU’s carefully laid plans.

European Council President António Costa originally wanted the gathering to accelerate negotiations on the bloc’s next seven-year budget, hoping to seal a deal before elections in France, Italy and Poland in 2027 make an already difficult agreement even harder.

But the world had other plans. Soaring energy prices, tensions with China, Russia’s war in Ukraine (and U.S. President Donald Trump’s ambiguity over it), migration and turmoil in the Middle East have all elbowed their way onto the agenda.

The result is a two-day marathon covering virtually every major challenge facing the EU, from keeping European factories competitive to ensuring the world’s most important shipping lanes stay open.

For anyone trying to follow the action without spending 48 hours glued to Brussels, here’s your guide to what matters.

With the usual warning: EU leaders are notorious for letting discussions drag on or reshuffling the agenda — that’s what our liveblog is for.

Thursday at dawn: The pre-match warm-up

Before the summit even starts, Europe’s political families will gather at the crack of dawn.

The European People’s Party meets from 7:30 a.m. at the Sofitel Brussels Europe — the place to be if you can get in, given how many center-right leaders will be at the summit table.

The Socialists gather from 8:30 a.m. at PES headquarters, with Costa, Spain’s Pedro Sánchez and Denmark’s Mette Frederiksen expected.

Renew kicks off at 8 a.m. at the Palais d’Egmont, with French President Emmanuel Macron and top EU diplomat Kaja Kallas among those expected.

Even without leaders in the summit room, the far-right Patriots got a head start Wednesday, with Marine Le Pen delivering a scathing attack on the state of the EU.

Thursday morning: The energy blame game and China

Leaders kick off with discussions on Europe’s struggle for economic competitiveness, starting with energy — potentially the most politically explosive debate.

Governments want immediate relief from soaring energy prices as a result of the war in Iran, and will push the Commission to introduce new measures on top of the wide-ranging but somewhat toothless package it announced back in March.

Expect finger-pointing between capitals and Brussels over who should act, and for climate policies like the upcoming Emissions Trading System on heating and transport to come under fire.

Next comes China. European Commission President Ursula von der Leyen will brief leaders on efforts to tackle the EU’s enormous trade imbalance with Beijing, following trade chief Maroš Šefčovič’s negotiations with Chinese officials.

Leaders are expected to renew their demand for Brussels to “urgently” tool up with further trade defenses to prevent further deindustrialization of the bloc and to shield further industrial sectors from Chinese competition.

There’s also time for the familiar fight over EU red tape, with calls for Brussels to stop legislating.

Thursday afternoon: Costa’s budget gamble

This was supposed to be the main event. Leaders will discuss Ireland’s negotiating proposal for the EU’s 2028–2034 budget slashed by €159 billion from the Commission’s original proposal.

The positions are well known: The self-styled “modernists” — essentially the old frugals in disguise — want to contain costs, while countries benefiting from EU spending are determined to defend their allocations, under the less glamorous banner of “friends of cohesion.” Positions on new EU-wide taxes are similarly entrenched.

But the real story is timing.

Governments have watered down a commitment to secure an agreement by December, according to draft conclusions seen by POLITICO. Costa wants a deal before a series of high-stakes elections in 2027 complicate negotiations; capitals fear a deadline could weaken their bargaining power.

Most importantly, Costa is moving into the driving seat as budget talks enter their most politically sensitive stage. Watch for clues about a possible extraordinary summit in late November — and whether December remains a credible deadline or leaders quietly start preparing for negotiations to spill into 2027.

Thursday dinner: Making room for new members

Over dinner, leaders will tackle enlargement and the EU reforms needed to accommodate new members — after all, October’s summit has historically been devoted to the bloc’s hopefuls.

Montenegro is edging closer to completing accession negotiations, while progress elsewhere raises questions about whether the bloc is institutionally and financially ready to grow.

The Commission has outlined proposals to prepare the EU for enlargement, and leaders will discuss how internal reforms should accompany the accession process. Watch for a positive signal to Montenegro and commitments on reforming the bloc itself.

Friday morning: Ukraine’s wish list

The second day begins with Ukraine and an expected appearance by President Volodymyr Zelenskyy. Declarations of European solidarity are all but guaranteed. The more interesting question is what leaders are actually prepared to do.

Kyiv needs air defense systems, interceptors and financing as Russian attacks intensify. Leaders could discuss tougher action against Moscow’s shadow fleet and visa restrictions for Russians. And while EU financing for Ukraine has already been agreed for 2026, the country’s needs beyond that remain an increasingly pressing issue.

Could this mean reopening the debate on using frozen Russian assets to plug future funding gaps? That remains a question mark — although no immediate breakthrough is expected.

Friday pre-lunch: Defense and three dangerous waterways

Before breaking for lunch, leaders will turn to Russian hybrid attacks, maritime security and the Middle East.

In the Black Sea, recent attacks on civilian shipping threaten Ukraine’s crucial grain export route. Turkey has floated new protected shipping corridors, while countries including Romania and Bulgaria are pushing to give the issue more attention.

Will leaders back concrete measures or stop at condemnation? That’s the question.

Discussions then turn to the Middle East and two other critical shipping routes: the Strait of Hormuz and the Red Sea. The fallout from the Iran–U.S. war, increased Iranian attacks around Hormuz and renewed Houthi threats in the Red Sea have disrupted global trade and energy flows.

The EU’s Aspides naval mission is short of vessels, and Kallas wants governments to contribute more. Watch whether leaders put ships behind their promises.

The broader Middle East discussion will also touch on Iran, Yemen, the West Bank and Lebanon.

Friday lunch: The migration showdown

Spain’s Pedro Sánchez, Italy’s Giorgia Meloni and Denmark’s Mette Frederiksen are worth watching as leaders discuss migration over lunch, following the crisis in Spain’s North African exclave of Ceuta.

Irregular arrivals have been declining, but disagreements remain over border crises, solidarity and tougher migration controls.

And with an election looming in Spain on Nov. 29, this could be Sánchez’s last tango — and a final chance to defend his government’s handling of the crisis while venting his frustration over the lack of European solidarity.

Watch whether the debate produces agreement or another political clash, as happened last time.

Bonus: Two pressers are better than one

With such a packed agenda, leaders won’t wait until the end of the summit for the usual joint press conference by von der Leyen and Costa. An additional one is planned for Thursday, after the budget debate.

On Thursday, watch Costa’s language on the budget deadline and whether von der Leyen offers any concrete measures on energy prices.

On Friday, look for promises of additional support for Ukraine, whether commitments on maritime security come with actual ships and resources — and commentary on how the migration showdown over lunch went.

Martina Sapio contributed to reporting.

BRUSSELS — European governments have watered down a commitment to secure a deal over the bloc’s next seven-year budget by the end of the year, according to draft Council conclusions seen by POLITICO.

European Council President António Costa is pushing leaders to finalize negotiations during a summit in December — before elections in France, Italy and Poland in 2027 threaten to derail the talks.

But governments are unwilling to commit to the end-of-year deadline, fearing that time pressure will undermine their leverage in the negotiations.

Leaders are gathering in Brussels on Thursday and Friday to react for the first time to an Irish budget proposal that envisages €159 billion cuts. They will also discuss energy prices, enlargement, Ukraine and migration.

Several countries, including Italy and France, urged Costa’s team to drop a reference to “reaching a final agreement by the end of the year” from the Council conclusions, two EU diplomats who were briefed on the discussions told POLITICO on condition of anonymity.

During a parliamentary speech Wednesday, Italian Prime Minister Giorgia Meloni said that “we will not sign an agreement that is not beneficial to us just to meet a deadline,” adding “we will sign an agreement only when it is right for Italy.”

There are also lingering concerns that Spain’s snap elections on Nov. 29 could work against the end-of-year deadline.

The new draft conclusions from Tuesday evening merely call for a “timely agreement,” adding that reaching a deal by the end of the year would allow EU funding to start flowing when the next budget takes effect in 2028. This is the same wording used in the Council conclusions from last June.

In another significant addition, EU leaders condemned U.S. President Donald Trump’s decision to lift sanctions on Russian diesel in the conclusions.

They also expressed “regret” towards U.S sanctions against the International Criminal Court and pledged to engage with Washington to reverse these measures.

Mathieu Pollet contributed to reporting.