It seems that the Russians are offering up air defense technology to the Iranians. It could be possible that the these systems are being offered at a substantial discount to the Iranians to convince them to drop their plans to make nukes. ie. Acquiring $5 billion in SAMs for $1 billion (my economics are most probably off but you get the picture)
For my theory to be correct the assumption must be made that the Iranians are only developing nukes for their own defense and perhaps the Russians or some third party understands their fears and wants to offer up discount SAMs to allay Iranian defense fears and to give them incentive to stop their nuke program without outright war.
Although judging by current US posturing and recent news it seems the Iranians don't feel that SAMs are enough.
For my theory to be correct the assumption must be made that the Iranians are only developing nukes for their own defense and perhaps the Russians or some third party understands their fears and wants to offer up discount SAMs to allay Iranian defense fears and to give them incentive to stop their nuke program without outright war.
Although judging by current US posturing and recent news it seems the Iranians don't feel that SAMs are enough.