Photos from the G-20 and U.N.

When he addresses the U.N. Security Council Thursday, the president will repeat the shocking proposal John Kennedy made a half-century ago: Get rid of nuclear weapons—forever.

Charles Dharapak / AP Photo

Charles Dharapak / AP Photo

President Obama and first lady Michelle Obama welcome France's President Nicolas Sarkozy and his wife Carla Bruni as they arrive for the G-20 summit dinner in Pittsburgh, Thursday, Sept. 24, 2009.

Philippe Wojazer, AFP / Getty Images

President Obama and first lady Michelle greet Russia's President Dmitry Medvedev and wife Svetlana Medvedeva as they arrive at the Phipps Conservatory for an opening reception and working dinner for heads of delegation at the Pittsburgh G20 Summit in Pittsburgh.

Chris Wattie / Reuters

Canada's Prime Minister Stephen Harper and his wife Laureen greet President Obama and first lady Michelle Obama as they arrive at the Phipps Conservatory for an opening reception and working dinner for heads of delegation at the G20 Summit in Pittsburgh, Pennsylvania September 24, 2009.

Carolyn Kaste / AP Photo

German Chancellor Angela Merkel is greeted upon her arrival at Pittsburgh International Airport in Coraopolis, Pa., Thursday, Sept. 24, 2009.

Scott Olson / Getty Images

Silvio Berlusconi, Prime Minister of Italy, arrives for the G-20 Pittsburgh Summit at the Pittsburgh International Airport September 24, 2009 in Coraopolis, Pennsylvania.

Kevin Lamarque / Reuters

President Obama and first lady Michelle Obama walk towards Air Force One as they depart New York for Pittsburgh to attend the G20 Summit September 24, 2009.

Carolyn Kaster / AP Photo

Chinese President Hu Jintao is greeted on the tarmac as he arrives at Pittsburgh International Airport in Coraopolis, Pa., Thursday, Sept. 24, 2009.

Carolyn Kaster / AP Photo

Russia's President Dmitry Medvedev gets into his waiting car on the tarmac at Pittsburgh International Airport in Coraopolis, Pa., Thursday, Sept. 24, 2009.

John Moore / Getty Images

U.S. Treasury Secretary Timothy Geitner (L) and Japan's Finance Minister Hirohisa Fujii sit for bilateral talks at the G-20 Summit on September 24, 2009 in Pittsburgh, Pennsylvania. The meeting was their first since Fujii became finance minister as part of the new Democratic Party of Japan cabinet.

Richard Drew / AP Photo

Uproar over Ahmadinejad

Mahmoud Ahmadinejad, president of Iran, waves following his address to the United Nations General Assembly on Wednesday night. The U.S., Canadian, French, and other Western delegations walked out of the speech, protesting his remarks about Israel.

Henny Ray Abrams / AP Photo

Obama, Ban Do Lunch

President Obama, right, and United Nations Secretary-General Ban Ki-Moon show each other to their seats at a luncheon during the United Nations General Assembly on Wednesday.

Seth Wenig / AP Photo

Qaddafi Arrives at the Summit

Libyan leader Muammar Qaddafi arrives at the 64th session of the General Assembly at United Nations headquarters, Wednesday, Sept. 23, 2009.

Charles Dharapak / AP Photo

A Rare Trilateral Meeting

President Obama sits with Israeli Prime Minister Benjamin Netanyahu, left, and Palestinian President Mahmoud Abbas, right, as they begin a trilateral meeting on the sidelines of the United Nations General Assembly in New York on Tuesday.

Seth Wenig / AP Photo

Focus on the Climate

French President Nicolas Sarkozy speaks at the summit on climate change at the United Nations on Tuesday.

Rick Gershon / Getty Images

A Special Mideast Envoy

Former British Prime Minister—and now special envoy of the Middle East Quartet—Tony Blair meets members of the press after they were briefed on the work of the Ad Hoc Liaison Committee at the United Nations on Tuesday.

John Angelillo, Pool / Getty Images

Spotlight on China

President Obama listens to President Hu Jintao of China speak at a bilateral meeting at the Waldorf Astoria Hotel on September 22, 2009 in New York City. The two leaders were meeting on the sidelines of the UN climate change summit and the 64th session of the United Nations General Assembly.

Frank Franklin II / AP Photo

Hollywood Lobbies for the Environment

Actor Djimon Hounsou speaks at the summit on climate change at the United Nations on Tuesday.

Charles Dharapak / AP Phto

Obama on the Climate

President Obama addresses the United Nations climate change summit on Tuesday.

Rick Gershon / Getty Images

Eye on the U.N.

President Obama makes remarks at the summit on climate change.