Tensions rocked the Western alliance Monday as European Union leaders backed France in its anger over a scuppered mega-contract, but US President Joe Biden addressed a key European grievance by easing Covid travel restrictions.

The tensions in the transatlantic alliance overshadowed the beginning of the UN General Assembly week, with Biden hoping to turn the page on the turbulent presidency of Donald Trump and rally allies in the face of a rising China.

Biden, who will address the summit Tuesday, is also seeking to step up action on fighting the pandemic and climate change, and forge global unity on Afghanistan, where the Taliban swiftly took control after he withdrew US troops last month.

Members of the South Korean boy band BTS arrive at the United Nations headquarters to deliver remarks on development
Members of the South Korean boy band BTS arrive at the United Nations headquarters to deliver remarks on development POOL / John Minchillo

But tensions with France suddenly took center stage after Australia last week canceled a multi-billion-dollar contract for French submarines, instead opting for US nuclear-powered ones as part of a new three-way alliance with Washington and London.

European Council chief Charles Michel said the bloc would seek answers, saying that allies needed to be sure of "transparency and trust."

"We are observing a clear lack of transparency and loyalty," he told reporters.

The United Nations (UN) headquarters amid the skyline of New York City
The United Nations (UN) headquarters amid the skyline of New York City AFP / Ed JONES

With Trump, "at least it was really clear -- the tone, the substance, the language -- it was very clear that the EU was not in his opinion a useful partner, a useful ally," Michel said.

European Union foreign ministers, meeting in New York, "expressed clear solidarity with France," top EU diplomat Josep Borrell said.

"This announcement ran counter to calls for greater cooperation with the European Union in the Indo-Pacific," he said.

French Foreign Minister Jean-Yves Le Drian has accused the United States of betrayal and Australia of back-stabbing, and has no separate meeting scheduled with US Secretary of State Antony Blinken.

French Foreign Minister Jean-Yves Le Drian, seen on a September 2021 visit to Qatar, has no meeting scheduled with US Secretary of State Antony Blinken amid anger over a submarine deal
French Foreign Minister Jean-Yves Le Drian, seen on a September 2021 visit to Qatar, has no meeting scheduled with US Secretary of State Antony Blinken amid anger over a submarine deal AFP / KARIM JAAFAR

Le Drian called on Europeans to "think hard" about alliances, saying the contract showed "the persistence of reflexes from a time we had hoped had passed."

US officials noted that Blinken will see Le Drian in a group setting Wednesday during talks on Iran amid last-ditch efforts to salvage a 2015 nuclear accord.

Asked about a bilateral meeting, senior State Department official Erica Barks-Ruggles said that "the schedule will remain dynamic."

Top EU diplomat Josep Borrell removes his face mask prior to speaking during a press conference following a meeting at the United Nations of EU foreign ministers that touched on a US-French row
Top EU diplomat Josep Borrell removes his face mask prior to speaking during a press conference following a meeting at the United Nations of EU foreign ministers that touched on a US-French row AFP / Angela Weiss

Biden also plans to speak by telephone with French President Emmanuel Macron, one of a number of leaders skipping the General Assembly due to Covid precautions, on "the way forward," another official said.

US officials said Blinken, a fluent French speaker who grew up in Paris, sought to contain damage Friday in a conversation with France's ambassador in Washington before the latter was recalled to Paris for consultations as a protest.

Officials said Blinken also passed along continued concerns by France and other allies over a ban on European travelers imposed at the start of the Covid-19 pandemic.

In a significant reversal, the Biden administration announced it would ease a Covid travel ban on all air passengers so long as they are fully vaccinated and undergo testing and contact tracing.

The European Union, eager to avoid a second summer without US tourists, had relaxed its own rules months ago and had been threatening to reimpose them, angry that the United States had not reciprocated.

European powers including Germany -- which has been circumspect in its remarks on the EU-France row -- hailed the shift on travel.

Biden took office vowing to defeat the pandemic but has increasingly faced political pressure as sections of the American public stubbornly refuse vaccinations and as the Delta variant sends caseloads rising again.

Biden will hold a special virtual summit Wednesday on ways to end the pandemic, with the United States seeking to show a leadership role after already donating more than 100 million Covid vaccine doses abroad.

Barks-Ruggles said the summit is aimed at seeing how to "have greater ambitions to get vaccines into arms quickly."

Hoping to avoid the spread of Covid, New York authorities have asked that all UN visitors be vaccinated.

One person who defied the recommendation was Brazil's far-right president, Jair Bolsonaro, who flew in despite his vaccine skepticism.

On the eve of the summit, he was spotted eating pizza on a New York street, apparently deprived from going inside because of the city's vaccination rules for restaurants.