I think the US will have to get the parties together and say ok , here's the deal. Here's the sticks and here are the carrots. Now, we are prepared to do a deal. So far the US hasn't brought forth this carrot that I am sure Iran is very concerned about... namely assurance that we won't attack them to change their regime by force... something that they are very concerned about so I think the pieces are almost in pace but not quite yet.