Gareth Porter: US must acknowledge that Iran has a broad influence that no US policy can alter Pt3/4
see
Gareth Porter: Potential Iranian Presidential candidates differ on nuclear policy
Gareth Porter: While Obama talks carrots and sticks, Iran questions sitting at the table
Dandelion Salad 
Israel has expressed concerns about the possible sale to Tehran of S-300s, sophisticated anti-aircraft missiles that could be used to foil airstrikes against Iranian nuclear sites.
We have provided Israel with long nuclear capable aircrafts in addition to assistance in developing nuclear bomb. Should Iran be capable to protect herself from Israeli’s airstrikes? The S-300 is a self-defense missile. As long as Israel would not attack Iran, then there should be not any need for Iran to use S300 missiles.
Should Iranian people not be able to defend themselves?
Considering the history of US foreign policy in the region, I am sure that Obama will screw things up as badly as any president who preceded him.