TEHRAN (AFP) - Iran's top nuclear negotiator Saeed Jalili said on Tuesday that talks with world powers aimed at resolving the crisis over its atomic drive were "positive and progressive," local media reported. "The negotiations have been positive and progressive, and in Geneva the seven nations got a better understanding of one another views," Jalili was quoted as saying by the Mehr news agency. He was referring to his talks on July 19 with representatives of major powers including EU foreign policy chief Javier Solana and, for the first time, an official from Tehran's arch-foe the United States, William Burns. Iranian President Mahmoud Ahmadinejad said in an interview with US television on Monday that if the United States adopted a genuinely new approach to his country Tehran would respond in a positive way. He also denied that Iran was working to manufacture a nuclear bomb. Israeli Defence Minister Ehud Barak, whose country considers Iran its greatest threat, urged the US during a visit to Washington to keep all options open in dealing with Iran's nuclear programme. "A policy that consists of keeping all options on the table must be maintained," Barak told US Defence Secretary Robert Gates, his Ministry said on Tuesday. "Iran's plans pose a threat to regional and global stability. We insist that it is vital to continue tightening the economic and financial sanctions imposed on the Iranians."