Nearly 130 leaders arrive in New York to restore trust in an institution that cannot pay its bills

Manhattan changes character on the Monday the world arrives, and that Monday is today. First Avenue closes to traffic between 41st and 48th Streets from this morning through Saturday. Motorcades idle three deep on the cross streets. Close to 130 heads of state and government are expected at the United Nations over the coming days, the largest single concentration of political power the city hosts in any year.

The week carries a theme this time. Khalilur Rahman of Bangladesh, president of the 81st General Assembly, has framed the session around restoring trust in an institution that has spent a decade absorbing the verdict of public opinion and, more recently, the arithmetic of unpaid bills. The contrast is difficult to miss. The organisation hosting this gathering has a 2026 regular budget of 3.238 billion dollars, cut by 15.1 percent from the year before, a staffing plan reduced by 18.8 percent, and member-state arrears that passed 1.6 billion dollars before the year began.

What actually opens this week

The distinction that most coverage blurs is the one the UN's own calendar makes explicit. The 81st session of the General Assembly opened on 8 September, with officials, ambassadors and the new president in the hall. What opens now is high-level week, the annual arrival of the leaders themselves.

Today, Monday 21 September, is a day of dedicated meetings before the main event. The European Council's programme notes that European Commission President Antonio Costa convenes a Partners for Solidarity event with Canada and Kenya this morning. The UN's own high-level page lists a one-day meeting aimed at mobilising political will on financing for development, the subject that sits underneath every other agenda item this year and that the organisation, in its present financial state, discusses from unusually exposed ground.

The general debate, the sequence of national speeches the week is famous for, begins tomorrow, Tuesday 22 September, and runs through Saturday 26 September, with a further sitting on the Monday. The General Assembly's general debate page puts expected attendance at close to 130 heads of state and government. Tradition gives the first podium slot to Brazil, and the speaking order published in advance runs to well over a hundred names.

The host's shrinking balance sheet

The numbers that define the host's position were settled months ago, but they have never carried this much weight in a leader week.

The regular budget adopted for 2026 stands at 3.238 billion dollars, a reduction of 577 million, or 15.1 percent, from 2025. The staffing table that accompanies it falls to 11,594 posts, a cut of 2,681 positions, or 18.8 percent. Both figures come from the Secretary-General's revised proposal, presented in December 2025 after the organisation's own liquidity warnings, and adopted by member states.

Behind the budget sits the arrears. UN leadership put unpaid regular budget contributions near 1.6 billion dollars at the end of 2025. The Better World Campaign, a US-based organisation that tracks American funding of the UN, placed US arrears alone above 2.2 billion dollars in February, spanning the regular budget and peacekeeping assessments. In August, Secretary-General António Guterres repeated the warning he has made all year, that the organisation faces imminent financial collapse without payments, while telling reporters he expected a US contribution very soon.

The cash management has become structural. In June, reporting on the Secretary-General's plans noted the organisation operating month to month on a budget already cut, and the assembly has since loosened the old rule requiring unspent funds to be returned to member states, one of a set of liquidity measures adopted to keep the organisation solvent through the year. None of this changes the underlying position, which is that the general fund depends on the payment behaviour of governments that are, this week, sending deputies to demand results.

The president's New York, from City Hall to the podium

Donald Trump lands in the middle of this on Monday, and the most-watched meeting of his first day is not with a head of state. The White House and City Hall have both confirmed that the president meets New York City Mayor Zohran Mamdani at Gracie Mansion this afternoon, in the mayor's own residence, with the mayor's office saying the discussion will focus on issues affecting New York City and New Yorkers. It is their third meeting since Mamdani's election, after a first Oval Office encounter in November that both men publicly called constructive, and it lands at the exact moment the president's security footprint and the mayor's city are jointly managing the largest police operation of the New York year.

The president addresses the General Assembly on Tuesday morning. The White House has also signalled a week of bilaterals. A meeting with President Volodymyr Zelenskiy of Ukraine has been the subject of active diplomacy, with Ukrainian officials telling reporters that as of late last week it was not yet finalised and the published itinerary did not include it. Teams on both sides continue to work on it.

One signature is expected on the sidelines that closes a file this site has followed in detail. The United States and Denmark announced a Greenland security agreement on 18 September, described by Copenhagen as binding and by Mr Trump as permanent, with the Danish prime minister saying it guarantees that China and Russia cannot have a base in Greenland. A Copenhagen statement puts the signing on the UNGA sidelines this week, with the Greenlandic government party to it. The full text had not been published at the time of writing; our analysis of what the deal does and does not transfer is here, and it will be updated when the document appears.

The city under lockdown

The security operation around the week is the largest the New York Police Department runs annually, and this year's footprint began earlier than the leaders. Police Commissioner Jessica Tisch set the core closure from 20 September: First Avenue between 41st and 48th Streets, the stretch facing UN headquarters, shut through 26 September, with the cross streets from 44th to 47th closed between First and Second Avenues. The city's transportation department has issued a gridlock alert for 21 to 25 September, rolling pedestrian zones and intermittent closures across Midtown East, and flight restrictions over parts of the city follow the leaders in.

For New Yorkers the week is a known ordeal. What is different in 2026 is the layer beneath it: the host institution's own staff have spent the year under hiring freezes and post reductions, and the organisation greeting close to 130 delegations does so with roughly one in five of its planned posts removed.

The dispute the assembly cannot vote away

Rahman opened the session on 8 September with a line that will be quoted all week: this is not 1945. His argument, made repeatedly since, is that public trust in the United Nations will not return through messaging but through structural change, beginning with the Security Council, whose five permanent members hold vetoes over its decisions and whose composition reflects the world that exited the second world war rather than the one that exists.

The general debate will produce dozens of speeches calling for exactly that reform, as it does every year. The obstacle is unchanged and arithmetic in nature: any amendment of the UN Charter requires the concurrence of the permanent members themselves, including the United States, whose arrears are the largest single item in the organisation's cash crisis, and whose president speaks from the assembly podium on Tuesday. The institution's most powerful member is simultaneously its largest debtor, the chief critic of its spending and the co-signer, this week, of one of its most consequential bilateral security deals in the Arctic.

That is the honest state of the host as the week opens. It has less money, fewer staff and the same veto structure it had in 1945, and it must now demonstrate, under the theme it chose for itself, that any of that can change.

The numbers that define the week

What would make this week different

Three things would move the story beyond speeches. The first is money: any announcement of actual payments against arrears, above all from Washington, would do more for the institution's stability than any resolution adopted in the hall. The second is the Greenland text: if the agreement is signed this week as Copenhagen expects, the published document will show for the first time what the United States has legally committed to, and what Denmark has legally refused. The third is the financing meeting itself: the one-day summit on development financing sets measurable commitments against the 2030 deadline, and the gap between what is pledged on Monday and what was pledged at the last such conference is the number that will quietly define whether this session's theme was rhetoric or repair.

The week has begun. The podiums open tomorrow morning.