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NEW YORK, NY - SEPTEMBER 28: (AFP OUT) (L-R) U.S. President Barack Obama, United Nations Secretary-General Ban Ki-moon and Russian President Vladimir join other world leaders and ambassadors in a toast during a luncheon hosted by Ki-moon during the 70th annual UN General Assembly at the UN headquarters September 28, 2015 in New York City. Obama held a bilateral meeting with Indian Prime Minister Narendra Modi and with have a face-to-face meeting with Russian President Vladimir Putin later in the day. (Photo by Chip Somodevilla/Getty Images)

NEW YORK, NY - SEPTEMBER 28:  (AFP OUT) (L-R) U.S. President Barack Obama, United Nations Secretary-General Ban Ki-moon and Russian President Vladimir join other world leaders and ambassadors in a toast during a luncheon hosted by Ki-moon during the 70th annual UN General Assembly at the UN headquarters September 28, 2015 in New York City. Obama held a bilateral meeting with Indian Prime Minister Narendra Modi and with have a face-to-face meeting with Russian President Vladimir Putin later in the day.  (Photo by Chip Somodevilla/Getty Images)