If Xiden pulls support Israel might be forced to up the game in a big way, particularly toward Iran. The Russia-vs-USA axis isn’t the same as the USA-vs-Russia competition. Putin wouldn’t cry if Iran was destroyed. He might make make some “I’m concerned” sounds for PR purposes but seeing Shi’ism & radical Islam reduced to cinders would serve his purposes too. Saudi Arabia & the Gulf States would pretty much react the same way.
I could be wrong, but with Trump in office, he moved our embassy to Jerusalem, cut off funding the PLO ,he recognized the Golan Heights as Israeli, he got several Arab Nations to make peace with Israel...all things that supposedly could not be done...
Now the exact opposite is happening, Hamas is emboldened, we are sending money to them again, Iran is swarming out ships in the Persian Gulf, etc....If Hezbollah in Lebanon miscalculates and joins the war, it will spread all over the place.....
The ultimate will be if Iran decides to directly confronts Israel instead of thru proxies, I think eventually they will it’s only a matter of time, if it’s now, so what, it has to happen and as you say, most of the Arab world might condemn everything but won’t do anything because they will be glad if Iran gets eliminated....