IAEA is not responsible for states that do not join the NPT. In fact the NPT signatories should be HELPED not hindered with nuclear technology. What is happening is the reverse: Pakistan, India Israel and whoever else did not sign the NPT is going scate free, while people who signed it, are being pressured. This is not the IAEA's problem, this is a political problem.
Russian defense ministry: Plane sent to intercept U.S. plane near border on Friday (Reuters)
from the article: IAEA chief: World must avoid confrontational rhetoric on Iran