President Bush will hold multilateral talks with world leaders at the 61st session of the United Nations General Assembly. Analysts debate on whether the U.N. can handle crises such as those in the Middle East and in Darfur.

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Senior correspondent Margaret Warner, who has been ordered to leave Iran where she was reporting for the NewsHour, talks about the mood now that President Ahmadinejad has rejected U.N. demands to stop processing uranium.

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Sudan said African Union troops may stay in the country but not under United Nations control. U.S. Assistant Secretary of State for African Affairs Jendayi Frazer talks about Khartoum's rejection of a U.N. force and attempts to forge a compromise.

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The U.N. Security Council approved Thursday the future deployment of more than 20,000 peacekeeping troops to Sudan's troubled Darfur region, despite opposition from the Khartoum government.

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An International Atomic Energy Agency report found that Iran continued its nuclear enrichment activities despite demands from the U.N. Security Council to stop research by the Thursday deadline.

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U.N. Secretary-General Kofi Annan visited Jerusalem Wednesday, calling for the removal of Israel's air and sea blockade of Lebanon. Israeli Prime Minister Ehud Olmert rebuffed the request until all ceasefire terms are met, including the release of two Israeli soldiers.

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U.N. Secretary General Kofi Annan announced Monday that he would visit Iran, one day after Iran repeated its intention to continue uranium enrichment despite a U.N. deadline to halt nuclear program activities. NewsHour Correspondent Margaret Warner reports from Tehran.

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U.N. Secretary-General Kofi Annan announced that the European Union had agreed to provide 7,000 troops, or nearly half the expanded peacekeeping force, to southern Lebanon. Analysts discuss the U.N. mission.

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Calling an end to genocide in Darfur one of its top priorities, the State Department announced Thursday that it would send one of its top diplomats to Sudan to try to convince the African nation to allow a peacekeeping force.

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The United States plans to present another U.N. resolution on disarming Hezbollah in southern Lebanon in an effort to flesh out a peacekeeping plan for the region and break an impasse in the international body.

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