In a speech at the Arc de Triomphe, French President Emmanuel Macron took aim at the style of nationalism that has been embraced by President Trump, warning a crowd of dignitaries and heads of state about how the splintering of multilateral institutions led to the first World War, and now threaten to divide the world once again.
With far-right nationalist politicians coming to power from Brazil to Italy to Austria, 40-year-old centrist Macron is set to invoke the war to make the case for global cooperation.
On Saturday, he was criticised for cancelling a visit to the Belleau Wood battleground north-east of Paris because of rain.
Culminating a week of World War I memorials, Macron also lighted a flame and laid a wreath to honor an unknown soldier who was killed in the war and whose remains are buried with others under the arch.
Other world leaders in attendance included the Russian president Vladmir Putin, the German chancellor, Angela Merkel and Turkey's Recep Tayyip Erdoğan.
The ceremony will mark the very hour - 11 am on November 11, 1918 - when the guns fell silent after more than four years of slaughter on the Western Front.
According to AFP, UN chief Antonio Guterres warned of "parallels" between the present day and the unstable and risky 1930s as he marked the centenary of World War I in a speech in Paris.
Macron was also set to speak later at United Nations cultural body Unesco and at the Peace Forum. "You can not fight better than we fought together", Mr. Trump said. For the first time in the German Parliament, the party entered 2015. But if Trump felt singled out by Macron's remarks, he didn't show it.
A preliminary seating plan of the lunch showed Trump placed next to Putin, The Guardian reported, but photos of the lunch released by the Russian presidency showed Putin seated between Juncker and UN Secretary-General António Guterres.
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French President Emanuel Macron: 'Nationalism is Treason'
It is their first meeting since the Helsinki summit , where the pair held closed-door talks and a joint press conference. Follow Business Insider Australia on Facebook , Twitter , LinkedIn , and Instagram .
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"President Macron of France has just suggested that Europe build its own military in order to protect itself from the US, China and Russian Federation", the US president tweeted, referring to remarks made by Macron in an interview three days earlier.
"Patriotism is the exact opposite of nationalism: Nationalism is a betrayal of patriotism", he said, adding that, when nations put their interests first and decide "who cares about the others" they "erase the most precious thing a nation can have".
The French leader also convened a "Paris Peace Forum" as part of the weekend's ceremonies, drawing worldwide organizations and nonprofits to discuss how to strengthen global governance.
"We are getting along from the standpoint of fairness, and to be fair, we want to help Europe, but it has to be fair", Mr. Trump said when a French reporter asked about the perceived insult.
Macron had angered Trump by saying Europe needed its own army and listing the U.S. along with Russian Federation and China as a threat to European security.
"We need a much better burden-sharing within North Atlantic Treaty Organisation", he said, patting his counterpart's knee affectionately.
And then at the end of the segment, Barthès says directly into the camera, addressing Trump: "Trump go f*ck yourself, you are not welcome in this country".
She came within a few metres before being apprehended by police.