In his first formal address to Roman Catholic cardinals, Pope Leo XIV on Saturday said he would continue the work of Pope Francis in steering the church in a more missionary direction, with greater cooperation among church leaders and a closeness to the marginalized.

Leo said he was committed to following a path of modernization and cited a major document that Francis issued in 2013. From that document, Leo highlighted multiple objectives, including “growth in collegiality,” “popular piety,” a “loving care for the least and the rejected,” and “courageous and trusting dialogue with the contemporary world.”

“Francis masterfully and concretely set it forth,” Leo said, referring to the document, called “Evangelii Gaudium.”

The new pope also explained the choice of his name. The previous pope with his name, Leo XIII, issued a document called the “Rerum Novarum,” known in English as “Rights and Duties of Capital and Labor,” in the late 19th century in which he emphasized the church’s right to make assertions about social issues as they related to moral questions.

The document “addressed the social question in the context of the first great industrial revolution,” Leo explained.

Now, the pope added, another industrial revolution was taking place in the field of artificial intelligence. That, he said, would “pose new challenges for the defense of human dignity, justice and labor.”

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Most American burgers are, in fact, not entirely American.

The patties grilled at backyard barbecues or flipped in fast-food restaurants are often a blend of ground beef, both homegrown and imported from other countries, especially Brazil. In school cafeterias and home kitchens, this global mix of beef is seared, fried and sizzled into millions of tacos, meatballs and lasagnas every day.

Now, President Trump’s dismantling of the global trading system through his imposition of broad-based tariffs is leading to shifts in commerce that could make winners out of countries like Brazil that produce commodities the world covets.

When it comes to beef — crucial to satisfying Americans’ hunger for cheap cuts of meat — tariffs will make Brazilian beef more expensive.

But at the same time, Brazil is suddenly a more appealing source for China, another enormous consumer of beef, because its trade war with the United States — and the high tariffs the two nations have imposed on each other — has left China looking for other countries with ample supplies of inexpensive meat.

While U.S. meatpackers, most likely anticipating escalating prices, have been stocking up on Brazilian beef in recent weeks, according to trade data, Brazilian beef exports to China also increased in April.

The surprising election of the first American pope felt fraught and disorienting to Roman Catholics around the world, who had considered such an outcome unlikely and perhaps unwelcome — until Pope Leo XIV stepped onto the balcony of St. Peter’s Basilica and chose to speak a few sentences in Spanish.

In an instant, the new pope, formerly Cardinal Robert Francis Prevost, signaled that his identity would defy easy categorization. He chose in that pivotal moment on Thursday evening not to say anything in English or mention the United States. He seemed intent on conveying the message that he was not a typical American.

It worked. Pope Leo, who was born in Chicago, has Creole heritage, lived in Peru for decades and speaks at least three languages, established himself as a citizen of the world. Catholics around the globe raced to claim pieces of his multicultural and multilingual background as their own.

“He considers himself American, but he also considers himself Peruvian,” said Julia Caillet, a 33-year-old osteopath, who was in line outside Notre Dame Cathedral in Paris for a special service for young Catholics celebrating the new pope on Friday evening. “He is a priest of the world.”

At a time when President Trump has isolated the United States from its diplomatic allies and trade partners and upended much of the world order, some Catholics worried that an American pontiff might somehow bring the Roman Catholic Church closer to the tumultuous American government.

Instead, Pope Leo appears to have reassured them, at least for now, that he would preserve the church as a global moral voice calling for peace and justice, especially for migrants, the poor and victims of war, in the mold of Pope Francis.

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He hugged a North Korean general. He squired China’s leader around with special care. He spoke of the sacrifices of soldiers. And he paraded Russian-made drones for the first time across Red Square.

President Vladimir V. Putin of Russia drew attention to the very factors that have enabled him to wage war against Ukraine into a fourth year, as he presided over festivities on Friday in Moscow to commemorate the 80th anniversary of Soviet victory over the Nazis during World War II.

Mr. Putin’s full-scale invasion of Ukraine in 2022 initially proved catastrophic for Russian forces, but he has since turned around the situation on the battlefield. Among his helpers: North Korean soldiers and ammunition, Chinese oil purchases and technology, Russian soldiers shouldering immense losses and seemingly unending swarms of Russian drones.

All were represented on Red Square in some way, as the Russian leader underscored to the world, through a Soviet-style display of pageantry and militarism, that he does not need to stand down in Ukraine.

“Truth and justice are on our side,” Mr. Putin told the more than 11,500 military personnel that the Kremlin said had gathered for the parade, including over 1,500 involved in Moscow’s war against Ukraine.

“The whole country, society and people support the participants of the special military operation,” Mr. Putin added, using the Kremlin’s chosen euphemism for the war.

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The leaders of Britain, France, Germany and Poland, on their first joint visit to Ukraine, said on Saturday that Russia would face “new and massive” sanctions on its banking and energy sectors if President Vladimir V. Putin refused to agree to a full, unconditional 30-day cease-fire.

Hours later, Mr. Putin brushed that demand aside and called instead for direct talks between Russia and Ukraine to be held in Turkey.

Mr. Putin, speaking to reporters in an unusual statement after 1 a.m. on Sunday, said Russia was “prepared for serious negotiations with Ukraine” and “without any preconditions.” He proposed a meeting between Russia and Ukraine in Istanbul on May 15, without specifying who would participate in the talks.

He did not directly address the European call for a 30-day cease-fire, but indicated Russia wouldn’t stop fighting before the negotiations on May 15, if they happen.

“The point is to eliminate the root causes of the conflict,” Mr. Putin said. “We don’t rule out that in the course of these negotiations, it will be possible to reach agreement on some new truces, on a new cease-fire, and a real one at that.”

Since President Trump took office vowing to pull back U.S. support for Ukraine, European leaders have worried that they would be unable to supply Ukraine with the weapons it needs.

So far, it looks like they were right.

The so-called coalition of the willing of European nations backing Ukraine has struggled to get materiel to its battlefields in the time since Mr. Trump made clear that Europe needed to shoulder more of the load for Ukraine’s security and its own.

That is one reason Ukraine’s Parliament overwhelmingly approved on Thursday a deal to give the United States a share of future revenue over natural resources, including minerals. While short of a security guarantee, it keeps open the possibility of continued shipments of American arms and other military assistance.

“This gives us hope,” said Yehor Chernev, the deputy chair of the Ukrainian parliament’s committee on national security, defense and intelligence.

In an interview shortly after the vote, Mr. Chernev said Ukrainian forces were running low on long-range missiles, artillery and, above all, ballistic air-defense systems — the majority of which are manufactured in the United States, according to an analysis by the Kiel Institute for the World Economy.

By summer, military aid approved under the Biden administration will run out, and Mr. Trump appears reluctant to renew it.

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In the fall of 2024, the cardinal who is now Pope Leo XIV sat at a large round table inside the Vatican, discussing the challenges that face the Roman Catholic Church with a cardinal from Ethiopia, archbishops from Cameroon and Kenya, a cardinal posted to Mongolia, and bishops from Texas and Liberia.

Joining them at the table were a Catholic podcaster from Dallas; a business consultant from Melbourne, Australia; a university administrator from Fiji; and a parishioner from Myanmar, three of whom were women.

Each person at the table, clergy or layperson, was allowed three minutes of uninterrupted speech.

“Every voice had equal value,” said Susan Pascoe, the business consultant, who is chair of Catholic Emergency Relief Australia. She sat at a table with the future pope for the meetings, which often stretched to 11 hours or more a day during four weeks in Rome.

Pope Francis dropped by to listen in, leading another meeting attendee, Wyatt Olivas, a college student from Wyoming, to refer to the pontiff as his “bestie in Christ.”

When Pope Leo XIV stepped out onto the balcony of St. Peter’s Basilica on Thursday and gave his first address as pontiff, he indicated that he would continue this practice of listening closely to many voices.

He called for a “synodal church,” referencing the process of dialogue between church leaders and lay people that was one of Pope Francis’s signature legacies.

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