Israel and the US have already made it clear that any military intervention in Iran's nuclear program will be strictly limited to a sufficient destruction of Iran's nuclear facilities and a singular objective to set back Iran's nuclear programs far enough that the costs to rebuild and time to achieve nuclear weapons capabilities would be prohibitive and set back by a decade or more.

In other words neither the west or Israel intend to initiate an all out war with Iran, including invasion and regime change.

Military strikes are still considered a final option, not the only option.. In Israel the threat and option of "limited strikes" on Iran are seen as the only option now.

The Iranian regime are not worried, regardless what "option" is used against them... They know they will not be directly targeted... At least not at first.

All of the choices and the potential outcome are up to the west and Israel now.

Iran isn't going to back down or relent.

IMO