UNITED NATIONS >> President Joe Biden made a robust case before the U.N. General Assembly today that the world must remain united in defending Ukraine against Russian aggression, warning that no nation can be secure if “we allow Ukraine to be carved up” as he tries to rally support for Kyiv’s effort to repel a nearly 19-month-old Russian invasion that has no end in sight.

The U.S. president called on world leaders to not let support for Ukraine diminish, arguing that Russia is counting on countries to grow tired of prolonged conflict in Kyiv which will “allow it to brutalize Ukraine without consequence.” Russia alone is standing in the way of a resolution, Biden argued, saying that Moscow’s price for peace was “Ukraine’s capitulation, Ukraine’s territory and Ukraine’s children.”

“I ask you this: If we abandon the core principles of the United States to appease an aggressor, can any member state in this body feel confident that they are protected?” Biden said in his address. “If we allow Ukraine to be carved up, is the independence of any nation secure?

He continued: “I’d respectfully suggest the answer is no.” He implored the leaders to stand up to “this naked aggression today to deter other would-be aggressors tomorrow.”

During his address, Biden described the partnerships that the U.S. government was fostering around the globe — from Africa to the Indo-Pacific — that he said were creating economic and other advancements, even as he stressed that those relationships were not about “containing any country” — a clear reference to Beijing.

“When it comes to China, let me be clear and consistent,” Biden said. “We seek to responsibly manage the competition between our countries so it does not tip into conflict.’

In his 30-minute address, Biden repeatedly emphasized the value of institutions such as the United Nations and international coalitions that have helped the world confront significant challenges such as poverty and disease, as well as echoing his defense of democracy, a common theme of his presidency.

“We will not retreat from the values that make us strong,” Biden said. “We will defend democracy — our best tool to meet the challenges that we face around the world. And we’re working to show how democracy can deliver in ways that matter to people’s lives.”

The annual forum is a chance for Biden to showcase to other world leaders — and the 2024 U.S. electorate — that he’s reestablished U.S. leadership on the world stage that he says was diminished under former President Donald Trump.

Biden previewed his thinking in a pair of fundraisers on Monday evening, telling supporters that he stood up to Vladimir Putin’s invasion, and questioning whether Trump, the 2024 GOP presidential front-runner, would have even attempted to help Ukraine stop the Russian land grab if he were in power.

“I will not side with dictators like Putin. Maybe Trump and his MAGA friends can bow down but I won’t,” Biden told supporters at a Broadway fundraiser.

There were some notable absences as Biden made his case before the General Assembly: British Prime Rishi Sunak, French President Emmanuel Macron, Chinese President Xi Jinping and Putin are all skipping the gathering.

For Biden, the more important audience for today’s speech could be closer to home as he looks to make the case to voters that he’s skillfully handled a complicated foreign policy agenda and that the experience that comes with age has proved to be an asset. It’s an argument that the 80-year-old president is likely to continue to make to try to counter skepticism — even in his own Democratic Party — among voters who are concerned about his age.

“We rallied the world to support Ukraine and united NATO because I was convinced from the beginning that Putin’s counting on NATO not being able to stick together,” Biden said at another Monday fundraiser. “He’s still trying. And our allies know once again, the United States can be counted on.”

Biden’s message of unwavering support for Ukraine will play out as Congress is increasingly divided over providing additional funding for Kyiv.

Biden has sought a package of $13.1 billion in additional military aid for Ukraine and $8.5 billion for humanitarian support. But conservative Republican lawmakers have been pushing for broad federal spending cuts and some of those allied with Trump are specifically looking to stop money to Ukraine.

In addition to underscoring continued U.S. support for Ukraine, Biden is expected to touch on mobilizing global resources to combat climate change and bolstering multilateral organizations to help poor and middle-income countries, according to senior administration officials.

Biden aims to send a message that Russia’s invasion of Ukraine is in violation of the U.N. charter and to emphasize that every country has a stake in defending a nation’s sovereignty, especially when it is under attack, said the officials, who previewed Biden’s activities in New York this week on condition of anonymity.

After the speech, Biden planned to meet with António Guterres, the U.N. secretary-general, as well as leaders from the so-called C5 group of Central Asian nations, which include Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan.

The meeting was expected to focus on regional security, trade, climate change, ongoing reforms to improve governance and other issues.

Xi has stepped up his own courting of those countries. During his own summit in May with the Central Asian leaders, Xi promised to build more railway and other trade links with the region and proposed jointly developing oil and gas sources.

White House national security adviser Jake Sullivan told reporters last week that Biden’s meeting with those leaders should not be seen as an effort to counterbalance Chinese influence in the region.

“Look, this summit is not against any country,” Sullivan said in previewing the meeting. “It is for a positive agenda that we want to work through with these countries.”

The officials played down the fact that the leaders of the other permanent members of the U.N. Security Council —- the UK, France, Russia and China — won’t be in New York this week and instead emphasized the importance that Biden attaches to showing up at the annual diplomatic forum.

However, Biden does not plan to attend a special summit on climate that Guterres will host on Wednesday, where countries are encouraged to bring new ideas and proposals on how to further cut emissions and combat climate change. Officials played down Biden’s absence at the climate summit, saying the issue will be interspersed through the president’s remarks and events throughout the week. John Kerry, the U.S. climate envoy, is to attend in Biden’s place.

Biden plans to meet with Brazilian President Luiz Inácio Lula da Silva on Wednesday, as well as Israeli Prime Minister Benjamin Netanyahu. Senior administration officials said the two leaders will discuss issues including Iran but declined to elaborate further.

Biden is scheduled to host talks Thursday at the White House with Ukraine President Volodymyr Zelenskyy.