US President Barack Obama, left, at an official breakfast on behalf of UN Secretary General Ban Ki-moon in honor of heads of delegations taking part in the 70th UN General Assembly session in New York City.

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From right: Ukrainian President Petro Poroshenko and United States Ambassador to the UN Samantha Power at an official breakfast on behalf of UN Secretary General Ban Ki-moon in honor of heads of delegations taking part in the 70th UN General Assembly session in New York City.

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US President Barack Obama at an official breakfast on behalf of UN Secretary General Ban Ki-moon in honor of heads of delegations taking part in the 70th UN General Assembly session in New York City.

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UN Secretary General Ban Ki-moon takes part in the 70th UN General Assembly session in New York City.

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UN Secretary General Ban Ki-moon, right, takes part in the 70th UN General Assembly session in New York City.

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King of Jordan Abdullah II bin Al-Hussein speaks at a plenary meeting of the 70th UN General Assembly session in New York City.

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King of Jordan Abdullah II bin Al-Hussein speaks at a plenary meeting of the 70th UN General Assembly session in New York City.

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The UN flag near the UN Headquarters hosting the 70th UN General Assembly session in New York City.

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September 28, 2015. US President Barack Obama at an official breakfast on behalf of UN Secretary General Ban Ki-moon in honor of heads of delegations taking part in the 70th UN General Assembly session in New York City.

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September 28, 2015. US President Barack Obama at an official breakfast on behalf of UN Secretary General Ban Ki-moon in honor of heads of delegations taking part in the 70th UN General Assembly session in New York City.

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President of the United States Barack Obama and President of South Africa Jacob Zuma, from left in the foreground, at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon in honour of the delegations taking part in the 70th session of the UN General Assembly in New York. ,

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President of South Africa Jacob Zuma at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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President of Ukraine Petro Poroshenko at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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Secretary-General of the United Nations Ban Ki-moon speaks at an official breakfast given in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama, right in the background, at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon, left in the background, in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama at an official breakfast given on behalf of Secretary-General of the United Nations Ban Ki-moon in honour of the delegations taking part in the 70th session of the UN General Assembly in New York.

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President of Belarus Alexander Lukashenko, centre, pictured on his arrival at the Headquarters of the United Nations for participation in a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama, centre, and his wife Michelle pictured on their arrival at the Headquarters of the United Nations for participation in a plenary meeting of the 70th session of the UN General Assembly in New York.

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September 28, 2015. President of the People's Republic of China Xi Jinping addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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Journalists listen to President of the United States Barack Obama speaking at a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama before speaking at a plenary meeting of the 70th session of the UN General Assembly in New York.

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President of the United States Barack Obama addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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September 28, 2015. President of the People's Republic of China Xi Jinping addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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September 28, 2015. President of the People's Republic of China Xi Jinping addresses a plenary meeting of the 70th session of the UN General Assembly in New York.

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