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NEW YORK, USA - SEPTEMBER 28: Russian President Vladimir Putin (R) greets Iran's President Hassan Rouhani (L) during their bilateral meeting in the UN Headquatters on September 28, 2015 in New York City. The ongoing war in Syria and the refugee crisis it has spawned are playing a backdrop to this years 70th annual General Assembly meeting of global leaders. (Photo by Sasha Mordovets/Getty Images)

NEW YORK, USA - SEPTEMBER 28: Russian President Vladimir Putin (R) greets Iran's President Hassan Rouhani (L) during their bilateral meeting in the UN Headquatters on September 28, 2015 in New York City. The ongoing war in Syria and the refugee crisis it has spawned are playing a backdrop to this years 70th annual General Assembly meeting of global leaders.  (Photo by Sasha Mordovets/Getty Images)