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Iranian President Mahmoud Ahmadinejad says last week's talks in Geneva between Iran and six world powers were "positive" and a "step forward."
In comments Wednesday, President Ahmadinejad said Tehran saw "better behavior" from some countries compared to what his country had witnessed in the past. He did not specify countries.
Mr. Ahmadinejad also said some countries had already offered to provide low-enriched uranium to Tehran for nuclear reactor fuel.
Last Thursday, world powers in Geneva announced a plan that would require Iran to ship uranium overseas for enrichment. Third party processing could ensure the uranium is enriched below the level required for nuclear weapons.
Iran agreed to meet with world powers again on October 19.
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Meanwhile, Iranian Foreign Minister Manouchehr Mottaki say the United States may have had a role in the May disappearance of a university researcher in Saudi Arabia.
Mottaki says investigators have obtained documents that show "U.S. interference" in Shahram Amiri's disappearance. He also says the Saudi government is responsible for the man's fate.
News agencies have described Amiri as a nuclear scientist. He had traveled to Saudi Arabia for a Hajj pilgrimage.
Elsewhere, a majority of Americans surveyed for a newly released poll indicated they would support military action against Iran to prevent the country from developing nuclear weapons.
The findings from the Pew Research Center for the People and the Press show 61 percent of those surveyed would favor military action. Researchers say 24 percent of Americans surveyed favored avoiding military action, even if Iran may develop nuclear weapons.
The United States and other Western countries suspect Iran is trying to develop nuclear weapons. Tehran says its nuclear program is for peaceful purposes only, and has agreed to let international inspectors visit a newly-revealed nuclear facility near the city of Qom.
Some information for this report was provided by AFP, AP and Reuters.