Maybe Iran, maybe not, but I thought this was interesting.
Israel's airstrike deep in Syria last October was reported to have targeted a nuclear-related facility, but details have remained sketchy and some experts have been skeptical that Syria had a covert nuclear program. An alternative scenario floating in Israel and Lebanon is that the real purpose of the strike was to force Syria to switch on the targeting electronics for newly received Russian anti-aircraft defenses. The location of the strike is seen as on a likely flight path to Iran (also crossing the friendly Kurdish-controlled Northern Iraq), and knowing the electronic signatures of the defensive systems is necessary to reduce the risks for warplanes heading to targets in Iran.
(I got to this via a very long guest post on Iran at Juan Cole.)