The United States expressed caution on Thursday toward a suggestion that Iran's uranium enrichment be sent to Russia for processing.

"The proof will be in the pudding. Let's see what happens," State Department deputy spokesman Adam Ereli said at a briefing.

On Wednesday, Javad Vaidi, a senior Iranian nuclear negotiator, said that his government was considering the proposal, put forward by Russia and Britain, France and Germany, that Iran uranium enrichment undergoes in Russia rather than Iran.

"The Russians have an idea out there, it's been discussed. At this point I can't really say what the Iranians' intentions are," Ereli said.

"Obviously what we want to see, what the Russians want to see, I think what the EU-3 want to see, what the IAEA want to see, is Iranian cooperation. To the extent that they do that, it's a good thing. Does this statement by this one person constitute that? At this point, it's just hard to say. We'll have to see," Ereli said.

The United States has vowed not to let Iran acquire nuclear weapons and threatened to refer Iran to the UN Security Council for possible sanctions.

Source: Xinhua