Quote Originally Posted by TinCow
This skips the most likely outcome which is that a nuclear exchange between Israel and Iran would ignite a general war in the region which would quickly involve NATO nations and possibly Pakistan, India, Russia, and China as well. Most likely it would be the start of WW3.
That is unlikely as the military bonds present during the Cold War are much weaker now. This is also an exchange that would occur over a matter of days or hours; far too little time for NATO to mobalize. Pakistan wouldn't get involved directly as they lack a sufficient delivery system. China would have the same problem with its army. They would also have to re-nuke portions of tiny Israel.