Ahmadinejad just shouts his mouth off about Israel to gain the popular vote. It's the same as Abdel Gamal Nasser shouting his mouth off to the Arab world about destroying Israel. Israel of course, then uses this as a pretext for a first strike claiming Egypt (in 1967) and Iran (in 2010) is an existential threat. If you look at all the wars (apart from 1973) since Israel's creation, Israel started every one of them.
Fabius, visiting Tehran, invites Rohani to France (Reuters)
from the article: Report: Israel to deploy nuclear-armed submarines off Iran coast