The United States says it wants to give Iran sanctions time to work before turning to other ways to prevent it from developing nuclear weapons.
Jim Jones, President Barack Obama's national security adviser, told CNN that Washington would keep pressure on Iran over its nuclear program but that the administration believed it had time before considering military action.
Jones said there were signs that sanctions were beginning to take a toll on Iran and said its nuclear expertise may not have advanced as far as previously feared.
Top Pentagon officials told Congress in April that Iran could produce enough highly enriched uranium for a single nuclear weapon in as little as a year but would probably need three to five years to assemble, test and deploy it.
compiled from Reuters reports