My thoughts are:

1. Israel drops an EMP bomb-immobilizes Iran.
2. Israel attacks their nuclear arsenals - destroys them
3. Hezbollah in retaliation fires missiles and perhaps chemical warheads at Israel
4. Israel retaliates by firing missiles with heavy payloads
5. China and Russia refuse to attack because not many Iranians are killed because of the EMP
6. US guards the straits and destroys any boats or subs which may block the waters