In his final address to the General Assembly, Biden urged countries to support coalitions to address global challenges

In his final address to the United Nations General Assembly, U.S. President Joe Biden defended his efforts to build coalitions to address global challenges and urged Allies to continue the work, even as conflicts in Ukraine and the Middle East put new strains on the alliance.

At the United Nations General Assembly on Tuesday, Biden called for collective action to address a host of emerging global problems, arguing that his efforts to strengthen and expand international institutions have paid off despite global turmoil.

"Many people look at the world today, see difficulties, and despair," Biden said. But I don't see it that way. I won't. As leaders, we cannot indulge in negative emotions."

"I recognize the challenges in Ukraine, the Gaza Strip, Sudan and elsewhere," he said. War, hunger, terrorism, atrocities, the displacement of record numbers of people, the climate crisis, democracy are all at stake."

Biden urged Allies to stand firm with Ukraine against an invasion by Russian President Vladimir Putin. He said Kiev's Allies "cannot let up."

"The good news is that Putin is losing this war. The other decision the world now faces is whether we continue to stand by Ukraine and help Ukraine win this war and preserve its freedom, or whether we choose to stand by and let aggression happen again and let a country be destroyed.

"I know what my answer is. We can't get tired. We cannot turn a blind eye and we will not relent in our support for Ukraine."

Speaking about the situation between Israel and Hezbollah in Lebanon, Biden said all-out war is in no one's interest and that a diplomatic solution is still possible.

According to Reuters, Lebanon expressed disappointment with Biden's speech to the General Assembly.

Lebanese Foreign Minister Ahmed Habib said Biden "did not send a strong signal" about the escalating crisis between Israel and Lebanon and was "helpless to resolve this crisis."

"The United States is the only country that can really make a difference in the Middle East and in Lebanon," Habib said.

The United States is Israel's longtime ally and largest arms supplier.