The U.N. nuclear chief says Iran should fully disclose its nuclear programs at the same time the U.S. and its allies start a dialogue with Tehran without preconditions.
But Iran's foreign minister sidestepped an answer, saying President Barack Obama must say how his policies differ from those of former President George W. Bush.
The two officials spoke while appearing together at the World Economic Forum in Davos.
Mohamed ElBaradei, who heads the International Atomic Energy Agency, welcomed Obama having said his government is willing to talk to Iran, unlike the Bush administration.
But Iran's Foreign Minister Manouchehr Mottaki refused on Thursday to say whether Iran would engage the Obama administration or answer all questions from the IAEA.
