US President Donald Trump will denounce "globalist institutions" in his first United Nations address since returning to the White House and also meet Ukrainian President Volodymyr Zelensky against a backdrop of mounting tension with Russia.

Trump will speak from the UN General Assembly rostrum for the first time since his political comeback as he tears down decades of US participation in international organizations.

Opening the annual summit, UN Secretary-General Antonio Guterres warned that aid cuts led by the United States were "wreaking havoc" in the world.

"What kind of world will we choose? A world of raw power -- or a world of laws?" Guterres said.

White House Press Secretary Karoline Leavitt said Trump would be touting "renewal of American strength around the world" and will des

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