Israel expressed dismay over the deal, arguing that it gives the Iranian nuclear ambitions legitimacy, but does not deal what Israel claims is a covert Iranian effort to develop a nuclear weapon.
Even with some degree of bluster, the Iranian government is seen as open to a deal with the West. The Vienna proposal originated as a request from Iran to provide fuel for the reactor, sent to the International Atomic Energy Agency this summer. It has since been developed into a fuel swap now considered as the first major opportunity to resolve Iran's six-year nuclear standoff. The IAEA's El Baradei said he hoped the deal would signal "a new era of cooperation," and eventual normalization of ties between Iran and the West.
IAEA personnel are expected to arrive in Iran this weekend for inspections of the Fardo nuclear enrichment site, a newly-revealed facility near the holy city of Qom. The West and Israel have long questioned Iran's claims that is nuclear program is for peaceful civilian purposes, and whether there are other nuclear sites that remain undeclared.
ABC News' Luis Martinez and Simon McGregor-Wood contributed to this report