New York - Addressing the United Nations General Assembly on Tuesday, U.S. President Joe Biden is expected to again denounce Russia's invasion of Ukraine as a violation of the core tenets of the U.N. Charter - the clear prohibition against taking other nation's territory by force.

"The president will absolutely reaffirm our commitment to the values of the charter. And that includes sovereignty and territorial integrity of all countries, including Ukraine," a senior administration official told VOA Monday during a briefing to preview Biden's speech.

Leaders from at least 145 countries are slated to attend the annual UNGA meeting this week in New York, with a few notable exceptions - France, the United Kingdom, China and Russia will be represented by their senior officials. This means that the United States is the only permanent member of the U.N. Security Council whose top leader will be present.

Biden Gears Up for UNGA, Central Asia Summit

It will be the second time Biden delivers his condemnation of Russia's "brutal, senseless" war on Ukraine in front of the world body. Last September, in his first UNGA address since the invasion, Biden accused Russia, a permanent member of the U.N. Security Council, of attempting to "erase a sovereign state from the map."

More than 140 U.N. member countries last year supported a General Assembly resolution that condemned Russian aggression against Ukraine.

But with the protracted conflict continuing to inflict a toll on global energy and food prices, there are growing calls from lower and middle-income nations often grouped as the Global South to fast-track peace negotiations between Moscow and Kyiv.

As part of Ukraine's diplomatic outreach to the Global South, it has supported the broadest peace initiative to date from Saudi Arabia, which in August hosted senior officials from some 40 countries including U.S., China, India but not Russia to work towards a broad agreement of key principles for a peaceful end to the war.

Zelenskyy, Biden Among Tuesday Speakers at UN General Assembly

Ukrainian President Volodymyr Zelenskyy will have a chance to make his own case Tuesday, speaking directly to the General Assembly. It will be his first in person appearance in front of the world body since Russia's invasion.

Biden is also expected to speak about U.S. efforts in mobilizing resources for global infrastructure projects, tackling the climate crisis, and reforming the U.N. and other international institutions to make it more 'inclusive, accessible and representative,' the senior administration official said.

Anita Powell contributed to this report.