Iran's Supreme Leader Ayatollah Ali Khamenei speaks during a ceremony to mark the 18th anniversary of the death of the founder of the Islamic Republic Ayatollah Ruhollah Khomeini at his tomb in the Behesht Zahra cemetery, south of Tehran, June 4, 2007. Iran will not beg world powers for its right to develop nuclear technology and has shown it will not retreat from the "field of danger" to protect such rights, Supreme Leader Ayatollah Ali Khamenei said on Monday. REUTERS/Raheb Homavandi (IRAN)