It may be running against some problems, challenges, but is with thre tonns of yellow cake riding quickly to 90%+ enrichment and weaponization in parallel. The fact Iranians only bought from Pakistan, is not true either. They bought from a number of Former Soviet Union republics, and also from European firms. North Korea has a role in their missile technology (which the IAEA only partially covers). Despite the problems, Iran's growing hegemony in the Middle East and success in penetrating Latin America, gives their regime the appetite to go for the nuclear bomb as soon as possible. Their penetration of Iraq is also successful, and it seems the USA gave Iraq to Iran in a silver plate. The same thing may happen to western Afghanistan, and slowly to all of Afghanistan. The shia / sunni divide which is explosive, has been managed by Iran in Gaza effectively, and is applying it to other areas where sunnis are majority, precisely like Afghanistan. The fact Heinonen doesn't want to talk neither of Ahmadinejad nor of ElBaradei, is deeeply worrying: undeoubtedly, there are power plays and tandem cooperation between them.
U.S. to defend Syrian rebels with airpower, including from Assad (Reuters)
from the article: Behind the scenes of UN nuclear inspection of Iran