Iran can change its current international isolation by relinquishing its nuclear weapons program, a top U.S. official said on Wednesday, adding that the world was united in its demand that Tehran suspend all uranium enrichment activities.

The remarks by White House spokesman Jay Carney, coming days before a planned round of nuclear talks between the Islamic Republic and western powers, followed comments by the head of Iran´s Supreme National Security Council, Saeed Jalili, according to which Iran could offer new proposals at the session.

"Iran´s representatives will participate in the negotiations with new initiatives and we hope that the P5+1 countries will also enter talks with constructive approaches," Jalili told English-language news network Press TV.

Jalili, Iran´s chief nuclear negotiator, said it was "ready to hold progressive and successful talks on cooperation" but that "the language of threat and pressure against the Iranian nation has never yielded results."

Speaking to the press on Wednesday, Carney addressed upcoming P5+1 talks, saying that there was an "international consensus about the absolute need for the Iranians to abide by their obligations, to forsake their nuclear weapons ambitions, to demonstrate verifiably that they can reassure the world that they do not seek to acquire nuclear weapons."

"And you know, our bottom line, our position is that Iran must -- lived up to its international obligations, including the full suspension of uranium enrichment, as required by multiple UN Security Council resolutions," Carney added.

Reiterating recent remarks by U.S. President Barack Obama regarding the "closing window" of opportunity to resolve the Iran issue, Carney said that the "Iranians need to demonstrate that they are serious, that they will engage in these talks seriously and focus on the issues that need to be resolved. Beyond that, we´ll have to see how they go."

"Well, I´m not going to negotiate from here on behalf of the P-5 plus one, but I think it´s important to note what has been clarified over the past three years, which is that the international community is united; Iran is isolated; the way to change that dynamic is for Iran to live up to its international obligations and to forsake its nuclear weapons ambitions," Carney added.

Referring to the Iranian nuclear issue on Monday, Carney said that, as a first priority ahead of nuclear talks, the administration of U.S. President Barack Obama put the cessation of Iran´s enrichment of 20 percent grade uranium in its underground facility in Fordo.

However, Carney added, the "bottom line" in upcoming talks would be to get Tehran to relinquish its nuclear aspirations altogether, ceasing all enrichment activities in the country.

"But there is enough time and enough space at this moment to pursue a diplomatic solution - that’s why the resumption of these talks is important," the U.S. official said. (© Copyright 2012 Ha´aretz 04/12/12)