BIARRITZ, France (AP) — A top Iranian official paid an unannounced visit Sunday to the G-7 summit and headed straight to the buildings where leaders of the world’s major democracies have been debating how to handle the country’s nuclear ambitions.

France’s surprise invitation of Iranian Foreign Minister Mohammad Javad Zarif was a high-stakes gamble for French President Emmanuel Macron, who is the host of the Group of Seven gathering in Biarritz.

Zarif’s plane left Tehran on Sunday morning and touched down a few hours later at the Biarritz airport, which has been closed since Friday to all flights unrelated to the official G-7 delegations.

ASSOCIATED PRESS Aan Iranian plane can be seen at the airport in Biarritz, France Sunday, Aug. 25, 2019. Iranian Foreign Minister Mohammad Javad paid an unannounced visit Sunday to the G-7 summit and headed straight to the building where leaders of the world's major democracies have been debating how to handle the country's nuclear ambitions.

A senior French official, speaking on condition of anonymity to discuss the sensitive talks, said Zarif went directly into a meeting with French Foreign Minister Jean-Yves Le Drian.

The Iranian foreign ministry spokesman, Abbas Mousavi, said Zarif flew to Biarritz at the invitation of the French foreign minister. Mousavi said on Twitter that there would be no meetings or negotiations with American officials during Zarif’s trip.

Asked whether the White House was aware of Zarif’s visit, the French official said, “We operate on our own terms” but noted that Macron and U.S. President Donald Trump met for two hours Saturday and discussed Iran at length, as well as at the group dinner.

The official described it as a Franco-Iranian meeting for the moment and said that France “is working in full transparency with the U.S. and in full transparency with European partners.” The Iranian had met with Macron on Friday.

ASSOCIATED PRESS Iran's Foreign Minister Mohammad Javad Zarif attends a joint press conference after talks with Norway's Foreign Minister Ine Eriksen Soreide, in Oslo on August 22.

Zarif, who is under U.S. sanctions, had been scheduled to go to Asia as part of a tour to seek support for Iran amid the American campaign against it since Trump withdrew the U.S. from Tehran’s 2015 nuclear deal.

U.S. Treasury Secretary Steve Mnuchin said Trump had not “set preconditions” on negotiations with Iran.

Zarif arrived as fissures emerged among G-7 leaders over how to deal with Iran.

Macron said the leaders agreed during a dinner the night before that the French president could serve as a G-7 messenger to Iran. Trump denied agreeing to anything, and Macron was forced to play down his role and acknowledge Trump’s status as “the president of the world’s number one power.”

The French official also said that based on Saturday night’s dinner, France considers it important to check in with Zarif to continue to bring positions closer together and ease tensions. The official said the French are not “mediators” but think they can contribute to de-escalation.

ASSOCIATED PRESS French President Emmanuel Macron, center left, and President Donald Trump, center right, participate in a G-7 Working Session on the Global Economy, Foreign Policy, and Security Affairs the G-7 summit in Biarritz, France, on Sunday.

Macron said he has no formal mandate to speak for the G-7 leaders in delivering a message to Iran, but that he would be able to address the issue in the context of what they agreed to during a dinner.

For several months, Macron has taken a lead role in trying to save the 2015 nuclear accord, which has been unraveling since Trump pulled the U.S. out of the agreement. His office said the G-7 leaders agreed he should serve as a go-between with Iran.

“I haven’t discussed that,” Trump said Sunday morning. He described the dinner as “very, very good” and blamed the media for anything that implied otherwise.

But it seemed from other accounts that the previous night’s dinner had been tense, with a clear divide between him and the rest of the G-7.

British Prime Minister Boris Johnson, greeting Macron for a morning meeting, congratulated the French president and shook his hand.

“Well done. Bien joué,” Johnson said, using the French expression for “well played” often uttered in a successful round of cards.

“You did very well last night. My God that was a difficult one. You did brilliant, you did brilliant,” he added.

Tristen Naylor, deputy director of the G7 Research Group, described the invitation as “a wildcard move.”

“The risks to the French president were quite large. He could have evoked a very strong and negative reaction from the American president — everything from outright condemnation to actually the American president just saying enough of this and getting on the plane and flying away,” Naylor said.

But the invitation was also something of a mirror of Trump’s own high-stakes diplomacy.

“Something that we’ve learned over the 2 ½ years about the American president is that what works with him, what resonates with him, is surprise, is a big move, something flashy,” he said. “And the French president has taken a page from it, I think, executed a maneuver out of it with great aplomb.”

German Chancellor Angela Merkel said Zarif’s presence was parallel to any G-7 events and that everyone agreed to seek more talks rather than tensions.

She added: “It is absolutely right to explore every possibility, and what we discussed yesterday — which wasn’t a formal assignment for anyone. But Iran certainly should know what we discussed.”

The G-7 leaders regrouped Sunday to focus on what they can do to boost growth at a time of heightened uncertainty. Manufacturers around the world are smarting from the trade dispute between the U.S. and China, which has led to new import taxes on hundreds of billions of dollars-worth of goods. Businesses don’t know where tariffs will be imposed next.

The White House had said putting the economy on the agenda was Trump’s idea, but the G-7 has for over four decades always included a focus on the economy. It was founded as a response to the Arab oil embargo in the 1970s and the recession that followed.

The backdrop is particularly worrying this year, with the U.S. economy slowing and Germany and Italy close to recession.

Meanwhile, Britain is due to leave the EU in October, and there is no agreement on how it should happen, raising the possibility of a disorderly exit that could wreak havoc for business in Europe.

Johnson said Britain and Europe needed to prepare for that, saying the prospect of a Brexit deal was “touch and go.”

The G-7 summit includes the heads of Britain, France, Germany, Japan, Canada and Italy as well as a representative of the 28-country EU.

In the nearby town of Bayonne, protesters demanded Macron do more to protect French workers and the planet.

A mix of activists, some wearing yellow vests, carried portraits of the French president as they marched Sunday in solidarity with environmental activists who removed official portraits of Macron from town halls around France earlier this year to protest his climate change policies.

Internationally, Macron is a vocal champion of fighting climate change, and has challenged Trump on the issue. At home in France, however, activists accuse him of lagging on promises to wean France from fossil fuels.

This story has been updated with additional details about Mohammad Javad Zarif’s arrival.

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Associated Press writers Nasser Karimi in Tehran, Iran, and Zeke Miller and David McHugh in Biarritz contributed to this report.