About 75 years too late to start contemplating what happens when you sell guns to irresponsible buyers.
What Biden SHOULD do is ORDER (not “urge” “ask” “request” or “suggest”) Netanyahu to cease fire immediately, and begin evacuating all the illegal West Bank settlements built after 1967. Then TELL Netanyahu that he has 4 hours to comply before US Aircraft carriers begin their departure back to the United States and Israel is free to deal with this situation completely on their own.
Just like those two US Aircraft carrier groups sent a message when they arrived…they can also send a message to all surrounding nations if they depart. Netanyahu might order the US news media to go into screaming protest, and the Israeli operatives in the US to begin false flag operations, and otherwise throw a temper tantrum, but none of their “behind the scenes” options would substitute for a physical military presence. Netanyahu would be furious and probably have half a dozen aneurisms, but there is nothing he could do but comply…and, of course, leak whatever dark scandal secrets he has on every politician in the USA…but it wouldn’t alter the situation that a US pull out would practically be an invitation to the surrounding nations to make today Israel’s last day of existence.