Quote from DrChaos:
I think the likely response would be an Iranian missile attack on Israel's reactor.
In the end, everybody's pissed but a 75% chance nothing catastrophic happens---at least right away.
The processing buildings near the Israeli reactor would likely be destroyed but the containment dome (and the radioactive fuel) would probably not be broken. You need a hard core bunker buster or a tactical nuke to open those.
Scenarios:
1) So, if there's an Israeli attack and mild Iranian response---and no oil facilities are damaged---I think markets make a relief rally.
2) If on the other hand, the Iranians convince the Shiites in Iraq to start attacking the US troops in mass and the US makes a shooting retreat like Saigon 1975----mid term moderate bear market as US power and prestige is seriously damaged for a long time as it was in Vietnam.
3) Second worst case scenario: Iran sends gas for real into Tel-Aviv: their missiles are much better than those pathetic Scuds. Quick sharp large drop, recovery after 6 months if less than 3 nukes used by Israel against military targets only.
4) Worst case scenario: Iran already has nukes, namely those 10 Ukrainian cruise missiles, and uses them. Israel is obliterated, and US prepares for invasion. Russia moves tactical nukes into Iran and signs defense treaty.
Exchanges shut for years.
The longer term problem though is that after an Israeli attack Iran would still be able to make a nuclear weapon in 3-5 years (facilities are too deep to be destroyed without large nukes) and would then be even more likely to use it.
The hope is that a more sane president in Iran comes to power, but after an attack all of them will be totally anti-Israel. Even the moderate educated segment of Iran who hate the theocrats is very much in favor of their nuclear program, and I bet most of them know that it's for bombs eventually.
Iran's idea is to have the capability for a quick switch to making weapons whenever they want.
I.e. they will make all the plans and calculations now, build all the facilities and technology, and just not make one so as to be technically within the bounds of the treaty. And then when people start to complain they'll pull a Kim-Jong Evil and say, "Oh screw that. we lied, we have lots of bombs now."