The United Nations was supposed to be the room where the world talks when war becomes too dangerous.
On Tuesday, it became the room where the threat of annihilation was delivered from the podium.
US President Donald Trump stood before world leaders at the 81st United Nations General Assembly in New York and presented Iran with a stark choice: make a deal with Washington or face what he described as the possibility of being “annihilated.”
The words were so blunt that members of the Iranian delegation began walking out of the chamber as Trump turned his attention to the conflict with Tehran.
And Iran was not the only delegation to leave.
Later in the address, when Trump described Cuba as a failed state whose communist government “will fall,” the Cuban delegation also walked out.
What was meant to be a gathering of nations suddenly looked like a theatre of confrontation.
‘Do I annihilate the Islamic Republic?’
Trump did not disguise the seriousness of the choice he said was before him.
“I have a big decision to make,” he told the assembled leaders.
He said the United States could either reach an agreement that would allow Iran to rebuild or choose a far more destructive path.
“Or do I annihilate the Islamic Republic and do it quickly,” Trump said, questioning whether Washington should deny Tehran “any chance” to rebuild its military strength.
The language was extraordinary for a diplomatic gathering designed around international dialogue.
But Trump paired the threat with another message: he still believed a deal could be reached.
He predicted that an agreement with Iran could come after the US midterm elections in November.
That contradiction — threatening Iran with destruction while simultaneously predicting a negotiated settlement — became one of the defining tensions of his address.
Iran walks out
The Iranian delegation did not remain in the chamber for the entire speech.
Senior members left roughly 10 minutes into Trump’s address as he began detailing his position on the war with Iran. One lower-level Iranian diplomat reportedly remained in the hall.
Iranian President Masoud Pezeshkian and Foreign Minister Abbas Araghchi were in New York for the UN gathering but were not present in the General Assembly Hall when Trump spoke.
The walkout offered its own diplomatic message: whatever conversation Washington and Tehran may eventually have, there was little appetite in the room for listening to a speech that placed the possibility of Iran’s destruction on the table.
From diplomacy to the language of war
Trump spent much of his address defending the US military campaign against Iran.
He argued that American action was necessary to prevent Tehran from obtaining nuclear weapons and portrayed US military power as having altered the balance of power in the Middle East. Reuters reported that Trump also called on other countries to economically isolate Iran in an effort to force it back to negotiations.
But the bigger question hanging over his words was not simply what Trump believes Iran should do.
It was what happens when diplomacy is conducted under the shadow of annihilation.
For Iran, the choice is being framed by Washington as a decision between negotiation and destruction.
For the rest of the world, it raises a more uncomfortable question: how far can a superpower push the language of military confrontation before diplomacy itself becomes impossible?
Then Trump turned to Cuba
If the Iran remarks brought the Iranian delegation to its feet, Trump’s comments about Cuba produced another walkout.
The US president described Cuba as an “absolutely failed state” and declared that its communist government “will fall.”
He said his administration was seeking a fundamental change in Cuba and claimed that the government was facing unprecedented pressure.
The Cuban delegation subsequently left the chamber.
Cuban Foreign Affairs Minister Bruno Rodríguez later rejected Trump’s description, accusing Washington of spreading what he called falsehoods and insisting on Cuba’s sovereignty.
Once again, the UN chamber had become a stage for opposing visions of sovereignty, power and political change.
Lula offered a different answer
The contrast became particularly striking when Brazilian President Luiz Inácio Lula da Silva addressed the assembly.
Where Trump emphasised military strength and pressure, Lula stressed diplomacy.
“We all know there will be no winners on the battlefield,” Lula said, arguing that diplomacy remained the path toward resolving international conflicts.
UN Secretary-General António Guterres similarly urged countries to strengthen cooperation and warned that military power alone cannot guarantee peace.
The opposing messages could hardly have been clearer.
One side spoke of military dominance and the possibility of destroying an adversary.
The other spoke of negotiation and the limits of force.
Gaza adds another layer
Trump’s speech was not confined to Iran and Cuba.
He also addressed Gaza, Ukraine, Venezuela, the International Criminal Court and America’s broader role in the world.
He claimed credit for helping end the war in Gaza and presented the United States as a major force in resolving international conflicts.
But other leaders used the same UN platform to sharply criticise Israel’s conduct in Gaza.
Turkish President Recep Tayyip Erdogan condemned Israel, while Qatar’s Emir Sheikh Tamim bin Hamad Al Thani focused heavily on the humanitarian crisis.
Israeli delegates subsequently walked out during Erdogan’s address.
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The symbolism was difficult to miss.
Different delegations were physically leaving the same room as competing versions of the world’s conflicts were being presented from the same podium.
The question the UN cannot escape
The most striking image from Trump’s speech may not ultimately be the threat against Iran.
It may be the empty chairs.
One delegation leaves when Iran is threatened.
Another leaves when Cuba is attacked.
Israeli delegates leave during Erdogan’s criticism.
And the world’s diplomats remain in a building whose fundamental purpose is to keep countries talking even when they profoundly disagree.
That is the contradiction at the heart of this year’s UN gathering.
The world still has a forum for diplomacy.
But increasingly, the language being heard inside it is the language of ultimatums, military power, sanctions, regime change and threats.
Trump’s message to Iran was unmistakable: reach a deal or face consequences he described in the most extreme terms.
Whether that pressure produces negotiations or pushes the conflict towards another escalation remains uncertain.
For now, the UN has witnessed something more revealing than another fiery presidential speech.
It has watched diplomacy itself become the battlefield.