WASHINGTON, Feb. 14 (Xinhuanet) -- The United States on Tuesday reiterated its calls for Iran to give up its nuclear programs or face further isolation from the international community.

    Iran must suspend all enrichment and reprocessing activity, cooperate fully with the UN nuclear watchdog International Atomic Energy Agency, and return to negotiations with the European Union, White House spokesman Scott McClellan told a news briefing.

    "If they're going to start restoring confidence with the international community, those are essential steps that the regime must take.

    "But if they continue to defy the demands of the international community, then they only further isolate Iran and undermine the aspirations of the Iranian people," the spokesman said.

    On a Russian proposal, under which Moscow would safeguard spent nuclear fuel in an effort to ensure that Iran does not develop atomic weapons, McClellan said the proposal was still viable.

    "That's an offer that remains on the table. It's one that we have expressed support for. We've expressed support for Iran's right to have civilian nuclear energy and the proposal that Russia has put forward," he said. Enditem¡¡