This alternative is to believe the assessment that nuclear regulators made that they were stockpiling 60% enriched uranium and installing new centrifuges that could further enrich to weapons grade even faster. AFAIK there is no other plausible explanation for doing this, nuclear reactors only need 5% enrichment or so:
https://www.iaea.org/sites/default/files/25/06/gov2025-24.pdf
It's also not a great look Iran immediately talks about testing a nuke a day after the attack. Despite that obviously being a lie, it at least makes it clear they don't seem to be trying very hard to hide it.
I'm sure Netanyahu has all kinds of nefarious reasons for doing this and with this timing, but this pretense at least seems pretty solid unlike Gaza and I'm sure there is genuine concern throughout their citizenry over how Iran would use them against them.
Russia only cared slightly, Trump blocked Russian sanctions already passed by Congress and stepped in to stop Ukrainian attacks on Russian oil and Russia will not burn such an asset for a minor partner catching this kind of heat (or any partner, since they "don't have the cards" as Trump would say if he wasn't a complete pushover for Putin)