Iran vowed on Sunday that it would never negotiate on its "obvious rights" for uranium enrichment work.

"There will be no negotiation for us over Iranian nation's obvious rights," Foreign Ministry spokesman Mohammad Ali Hosseini made the remarks at his weekly press conference, just one day before President Mahmoud Ahmadinejad's planned announcement for "good news" on Iran's nuclear program.

Iran's rights of uranium enrichment was under Non-Proliferation Treaty (NPT), and the nuclear program is peaceful, said Hosseini, insisting Iran wants no nuclear weapons.

The spokesman also stressed the newly approved UN sanction resolution was an obstacle for nuclear talks.

"It is not feasible to issue a resolution on the one hand while urging negotiations on the other hand," he said.

Ahmadinejad has promised to give the Iranian people a "good news" on the upcoming Monday at Iran's Natanz nuclear facilities.

It's still not clear what kind of announcement he would make, but some observers have forecasted he would declare the complete installation of 3000 centrifuges.

Resolution 1747, passed by the UN Security Council in the end of last month, urges Iran to suspend uranium enrichment work "without further delay."

The new sanction, moderately harsher than those included in previous resolution on Iran's nuclear issue, calls for a ban of Iranian arms exports, a freeze of assets of an additional 28 individuals and entities involved in Iran's nuclear and missile programs.

In the previous resolution, adopted last December, the UN Security Council ordered all countries to stop supplying Iran with materials and technology that could contribute to its nuclear and missile programs.

The new resolution calls for voluntary restrictions on travel by the individuals subject to sanctions, on arms sales to Iran, and on new financial assistance or loans to the Iranian government.

It asks the International Atomic Energy Agency to report back in 60 days on whether Iran has suspended enrichment work.