Iranian President Mahmoud Ahmadinejad delivers a speech in front of a portrait of Iran's late founder of the Islamic Republic, Ayatollah Ruhollah Khomeini, during the 18th anniversary of Khomeini's death at his mausoleum in Tehran, June 2007. Ahmadinejad vowed Iran would not back down in the standoff over its nuclear program, saying the Islamic republic was 'invincible' in the face of Western threats.
(Photo: BEHROUZ MEHRI/AFP/Getty Images)
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