Iran has NEVER said they will nuke Israel! In fact they have said nuclear weapons are against Islam. They have stated the Zionist regime should be wiped off the map but never said they would do it. A "regime" is a form of government, NOT a country. The ONLY threat Iran has directed at Israel is in the unlikely event of an Israeli attack on Iran they will respond mightily.
from the article: Report: IAEA to discuss Israel's nuclear activities for first time