I'd like to think that the US is keeping a close eye on Iran, but then again, I don't know that barack hussein obama is allowing the US intelligence community to do it's job with this rogue nuclear terrorist state. My best guess is that we are doing SOMETHING. Vice President Joe (Slow Joe) Biden and others within the obama regime have suggested that the problem is not with Iran, but with Israel.
Since Iran announced its intentions to use any nuclear weapons that it produces to attack Israel, the Israelis are naturally interested in missile acquisitions by the radical (and some would say insane) Iranians.
Iranian president Ahmadinejad (photo right) has the face that we can all trust. Look at his ugly mug. It screams "trust me". Strangely, I do take him at his words that "the Great Satan" (that would be the US and allies) don't have the guts to do anything about him or his dastardly plans. I think that the Israelis would agree with me. The US is a paper tiger these days, the obama regime a de facto ally of Iran - because you are forced to take sides in these matters.
The development of a fleet of Heron TP drone aircraft by Israel shows that they are going to keep an eye on the people who have sworn to destroy them.