‘America Is Back,’ Biden Declared in June. The World Is About to Test Him.

WASHINGTON — When President Biden gathered with satellite leaders astatine an English seaside edifice successful June, it was a backslapping solemnisation of America’s instrumentality to diplomatic stableness aft 4 years of public dressing-downs and impulsive argumentation withdrawals nether President Donald J. Trump.

“America is backmost astatine the table,” Mr. Biden declared astatine that meeting, the Group of 7 summit.

In the tumultuous 4 months since, the president has recovered that not being Mr. Trump is not capable to execute his ambitions astatine location oregon abroad.

In his past nationalist remarks earlier leaving Washington for the Group of 20 gathering successful Rome this weekend, Mr. Biden was inactive struggling to unify Democrats down a $1.85 trillion economical and biology spending plan. That blueprint included much than $500 cardinal to combat planetary warming, which helium had hoped to usage arsenic leverage to unafraid commitments from different leaders erstwhile helium attends a clime acme successful Scotland aboriginal adjacent week.

“It’s astir expanding opportunity, not accidental to deny,” Mr. Biden said connected Thursday. “It’s astir starring the world. We’re letting the satellite walk america by.”

Mr. Biden, who often refers to his skills arsenic a negotiator and his decades of overseas argumentation experience, volition question commitments from overseas leaders to combat the pandemic, untangle proviso concatenation knots and dilatory a unreserved of ostentation astir the world. He volition besides question to antagonistic disapproval astir the chaotic withdrawal of American troops from Afghanistan successful August and mend a rift with France implicit a atomic submarine deal.

“I bash inactive deliberation that the president enjoys a tremendous magnitude of cardinal bully volition successful Europe,” said Ian Lesser, acting president of the German Marshall Fund of the United States. Although recent polling from Gallup shows that America’s lasting astir the satellite has rebounded from the lows of the Trump era, “just due to the fact that Biden is not Trump doesn’t marque each of the argumentation issues casual to address,” Mr. Lesser said.

Mr. Biden volition statesman his clip successful Rome by visiting Pope Francis, but aft that, diplomacy is connected the agenda. He volition conscionable Sergio Mattarella, Italy’s president, and Mario Draghi, its premier minister, and clasp different gathering aboriginal that time with President Emmanuel Macron of France. Giving the French precedence is simply a awesome that Mr. Biden is trying to assuage them aft the United States reached an statement to supply Australia with atomic submarines — efficaciously cutting France retired of its ain multibillion-dollar submarine woody with Australia.

The president volition not conscionable with 2 rival leaders — President Vladimir V. Putin of Russia and President Xi Jinping of China — who are staying location from the league implicit Covid concerns.

Before the trip, Jake Sullivan, the president’s nationalist information adviser, discounted the thought that Mr. Biden would person little of a enactment relation astatine the 2 summits if helium traveled to Europe without a signed economical and biology spending deal, oregon the transition of the large infrastructure measure pending successful Congress.

Speaking with reporters connected Thursday aboard Air Force One en way to Rome, Mr. Sullivan said Mr. Biden would denote plans to modernize stockpiles and “create resilient proviso chains.” He said different large absorption astatine the G20 would beryllium securing a communiqué that would outline a program to support the globe against aboriginal pandemics.

“What the G20 volition beryllium focused connected is the future,” Mr. Sullivan said. “How bash we forestall a aboriginal pandemic? How bash we guarantee that the satellite is coordinated successful a mode that it wasn’t sufficiently coordinated erstwhile Covid-19 deed past year?”

And Mr. Sullivan said that the president considered the absences of Mr. Putin and Mr. Xi not arsenic an obstacle to coordination but an accidental to showcase that Western democracies are susceptible of moving unneurotic to lick existent and aboriginal threats. On Saturday, Mr. Biden’s archetypal large gathering of the acme volition beryllium focused connected economical argumentation and the pandemic, and past helium volition conscionable with the leaders of France, Germany and Britain to sermon ways to get the 2015 atomic accord with Iran backmost connected track, 1 of Mr. Biden’s astir elusive diplomatic goals since assuming the presidency.

Gita Gopinath, the main economist astatine the International Monetary Fund, said that the astir urgent economical task for leaders astatine the G20 acme is slowing the pandemic — successful ample part, she said, by making bully connected promises to vessel vaccine doses to little affluent nations that stay captious to proviso chains and the planetary system but person struggled to summation entree to shots.

“To genuinely extremity this wellness situation and its accompanying economical crisis, we request to get to wide vaccinations everyplace successful the world,” Ms. Gopinath said.

Mr. Biden’s advisers said helium was counting connected astatine slightest 1 economical argumentation triumph from the conference: the blessing of a global statement to acceptable minimum levels of firm taxation, aimed astatine stopping companies from sheltering income successful taxation havens similar Bermuda.

Mr. Biden’s softer diplomacy skills volition beryllium enactment to the trial erstwhile helium meets with Mr. Macron hours aft helium arrives successful Rome. In September, Mr. Biden’s medication caused a diplomatic row with the French aft failing to notify them of its woody to merchantability nuclear-powered submarines to Australia, an accord that gutted a $66 cardinal French task to physique onslaught submarines.

The deal, announced arsenic portion of a caller defence confederation with Britain and Australia, truthful infuriated the French that Mr. Macron recalled his country’s ambassador to the United States, Philippe Étienne, for respective days. American officials, including Antony J. Blinken, the caput of state, person streamed done France trying to repair the damage. Vice President Kamala Harris is owed successful Paris successful November.

Célia Belin, a visiting chap successful the Center connected the United States and Europe astatine the Brookings Institution, said successful an interrogation that the Biden medication seemed to hide “the tasteful creation of diplomacy.”

Since the blowup, Mr. Macron has spoken openly astir the request for European nations to signifier alleged strategical autonomy, a argumentation that would gradually mean countries similar France would trust little connected the United States for subject assistance. As the acme gets underway, Europeans volition beryllium watching with involvement astir whether Mr. Biden supports specified an initiative, Ms. Belin said.

Mr. Biden is besides expected to code astatine slightest 1 much rocky diplomatic narration portion abroad. In caller days, President Recep Tayyip Erdogan of Turkey has threatened to callback its ambassador to the United States aft respective embassies, including America’s, called for the merchandise of an imprisoned activist.

Mr. Sullivan, the nationalist information adviser, said helium anticipated that Mr. Biden would conscionable Mr. Erdogan successful Scotland.