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TEHRAN - Iran's chief nuclear negotiator expressed hope for "good and constructive negotiations" as he left Tehran on Friday for a meeting in Geneva with world powers on the country's disputed nuclear program.

Iranian media said Saeed Jalili was asked about the expected presence of a senior US diplomat at Saturday's talks in the Swiss city.

"If they enter (negotiations) with a constructive approach and by avoiding previous mistakes, we can definitely have good and constructive negotiations," Jalili was quoted as saying by the ISNA news agency.

"What is important from our view point is with what approach the other side is having a presence in negotiations," he said. "The kind of approach is more important than which people would attend the talks."

The United States said on Wednesday it was sending an envoy to Geneva to join nuclear talks with Iran for the first time, to underline to the Islamic Republic and others that Washington wanted a diplomatic solution to the impasse.

Senior US diplomat Williams Burns will join EU foreign policy chief Javier Solana and officials from Britain, France, Germany, Russia and China for the talks.

The United States, which cut diplomatic ties with Iran shortly after its 1979 Islamic revolution, accuses Tehran of seeking to build nuclear bombs.

Iran, the world's fourth-largest oil exporter, says its nuclear work is solely aimed at producing electricity.