Iran's Supreme Leader, Ayatollah Ali Khamenei, has said his country is ready to share its nuclear technology with other nations.
Ayatollah Khamenei made the offer during a meeting with visiting Sudanese President Omar al-Bashir.
US Secretary of State Condoleezza Rice condemned the comments.
Earlier, Iran's top nuclear negotiator threatened to suspend co-operation with the UN's nuclear watchdog if Teheran faced sanctions over its nuclear work.
As well as threatening to end Iranian co-operation with the UN, negotiator Ali Larijani said Iran would "hide" its nuclear programme if it was attacked.
"They [Western countries] have to understand they cannot resolve this issue through force," Mr Larijani told a conference on Iran's controversial nuclear energy programme in Tehran.
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