Iran performs military drills to prove it can protect its nuclear sites

Tensions seem to be growing over Iran's nuclear sites. This weekend Iran performed military drills to prove they are capable of defending their nuclear sites, and potentially retaliating. They still claim they are willing to work out the fuel-swap agreement, but only under some additional conditions. The aspect of the whole situation that seems most unstable and complex to me is how the internal political debates in Iran are playing out, and how this has the potential to undermine international dialog.
L.A. Times article on the military drills


Also, it's interesting reading news from Tehran... here's an article making the case that Iran genuinely needs the nuclear fuel for medical purposes:
Tehran Times article on medical need for isotopes generated at reactors