TEHRAN, Iran — Iran's hard-line President Mahmoud Ahmadinejad vowed Thursday that Iran won't back away from uranium enrichment and said the world must treat Iran as a nuclear power. AP Photo Iranian President Mahmoud Ahmadinejad gestures as he stands in front of picture of Iran's late leader Ayatollah Khomeini and addresses a meeting of students and universty staff in Mashhad in Khorasan Razavi province, 530 miles northeast of Tehran, Iran, Wednesday, April 12, 2006. The comments were made as Mohamed ElBaradei, head of the International Atomic Energy Agency, arrived in Tehran for talks aimed at defusing tensions over Iran's nuclear...