Iranian President Mahmoud Ahmadinejad waves before entering an airplane upon his departure to the United States to attend the UN General Assembly, at Tehran’s Mehrabad Airport, on September 22, 2012. Ahmadinejad is due to address the UN General Assembly in New York. speech this year was keenly awaited in the face of sharp differences with the UN Security Council over Iran’s controversial nuclear programme, and Israeli threats to launch pre-emptive strikes on Iranian nuclear facilities. AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP/GettyImages)