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Iran's Supreme Leader Ayatollah Ali Khamenei delivers a sermon during his visit to Mashhad, 741km (463 miles) east of Tehran, March 21, 2009. Khamenei said on Saturday U.S. President Barack Obama's offer of better ties was just a "slogan", but pledged Tehran would respond to any real policy shift by Washington. Speaking a day after Obama's videotaped overture, Khamenei, Iran's most powerful figure with final say on all matters of state, said he saw no such change yet from the United States.