"A policy that consists of keeping all options on the table must be maintained," Barak told the US defence secretary during a meeting in Washington on Monday, the ministry said in a statement.

"Iran's plans pose a threat to regional and global stability. We insist that it is vital to continue tightening the economic and financial sanctions imposed on the Iranians."

Monday's meeting came amid a continuing diplomatic impasse with Iran over its nuclear drive and just days after Tehran announced that its uranium enrichment facility in Natanz has now expanded to 6,000 centrifuges.

It also came after the United States on July 19 took the unprecedented step of sending a top diplomat to meet Iran's chief negotiator at talks in Geneva aimed at resolving the standoff.

Washington also indicated it was considering sending diplomatic personnel to Tehran to open a US interests section there.

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