FARS, this information interests me. The maintenance of the fissionable materials is very indepth and costly. Does Iran have the capabilities and infrastructure to maintain these warheads or would they pretty much be "dirty" nukes?
For an H-bomb.
Especially when it needs to be near a design optimum for small size/light weight/high yield missile delivery.
A pure fission bomb can be much more robust and heavy. It only needs to survive being wrapped in a bale of marijuana and smuggled across any poorly defended border.
It also doesn't need to be a 10 MT city vaporizer. A few kT to destroy a down town would suffice.