[peterloo]

I don't think anyone will dare to start a war.

Even through Iran has nuclear arms, Isreal has even more nuclear weapons and possibly a second strike ability. I don't think Iran has any second strike ability, so she dare not press that red trigger, fearing a deadly retaliation.

Finally, Isreal has got some good anti-missiles system, most remarkably MIM-104 Patriot. I don't think Iran wants to see a mutual destruction between her only nuclear missile and a patriot missile

In conclusion, Iran is just showing off and trys to put some pressure on Isreal and her allies. Iran still lacks a ability to massively produce nukes use them well.