LONDON - World powers agreed Friday to try again to lure Iran to the nuclear bargaining table with a repackaged set of carrots to accompany the stick of U.N. sanctions.

Diplomats said the offer contained no major new enticements but was meant to remind the clerical regime that talking is still an option.

The central terms of a 2006 compromise stand: Iran could trade away worrisome elements of its nuclear program for economic and political incentives and the possibility of a better relationship with archrival Washington. Iran turned down that invitation, saying it came with insulting strings attached, and Western diplomats were hard-pressed to say why the response would be any different now.

The U.N. Security Council has imposed three sets of mild financial and other sanctions on Iran as a cost of spurning the offer.

The strategy session on Iran was part of diplomatic meetings on the Mideast and Kosovo attended by U.N. Secretary-General Ban Ki-moon, Secretary of State Condoleezza Rice and other leaders.

On Iran, details of the amended offer being made by the United States, Britain, France, Russia, China and Germany were not revealed, and the precise text is still a work in progress.

The catch for Iran remains: It would have to shelve its program to enrich uranium before negotiations over possible rewards begin. Enriched uranium can be used for nuclear power or weapons.

"We very much hope that they will recognize the seriousness and the sincerity with which we've approached this issue," British Foreign Secretary David Miliband said after a meeting of senior diplomats from all six nations.