"Over the nuclear issue, we prefer cooperation to confrontation," Mottaki told reporters after meeting with his Kazakh counterpart Kasymzhomart Tokayev here on Tuesday.

EU foreign policy chief Javier Solana submitted the proposals to Iran's chief nuclear negotiator Ali Larijani on Tuesday.

"We had a constructive talk, there are some positive steps but also ambiguities in the proposal, we will study the package and then give a response," Larijani told reporters after meeting with Solana.

"Now that the proposal is on the table, I hope we can receive a positive response which can satisfy both sides," Solana said after a separate meeting with Mottaki.

Though details of the proposals have not been made public, the package presented by five permanent members of the UN Security Council plus Germany offered favorable incentives to Iran if Tehran suspends uranium enrichment to pave the way for talks.

The package also includes an implicit threat of UN sanctions if Iran doesn't comply.

According to the Washington Post on Wednesday, Iran has been offered the possibility to carry out uranium enrichment if the International Atomic Energy Agency (IAEA) and the UN Security Council are satisfied that Iran is not seeking nuclear weapons.

Iran has insisted on its right to peaceful nuclear technology, saying it only wants to enrich uranium to make reactor fuel.

But the United States has accused Iran of acquiring an atomic bomb under the cover of civilian nuclear program.