- No hint of USA involvement.
- Israel government probably does not want to take chances that Iran will fake out the USA with insincere diplomacy.
- Iran plans the counterattack against Israel.
- Israel may have to consider how much time Iran has left to rebuild their air defenses which Israel destroyed previously after the big Iranian missile attack.
Excerpt:

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Source: https://www.timesofisrael.com/liveblog_entry/iran-has-plans-for-immediate-counterattack-if-israel-strikes-nuclear-facilities-nyt-reports/