Might really is doing some heavy lifting here. If the UN turns on Israel and they become sanctioned by the west the most likely outcome is that Israel turns to China. China needs stabilizing forces in the Middle East because of their lack of domestic fossil fuels. They also see similarities between the Gaza situation and Taiwan. The Israelis are fiercely aggressive on security issues. They will not give up on that because of sanctions I think. What US backing is really doing is mostly just making it cheaper for Israel to defend itself so that the Israelis feel less pressure to be aggressive with making buffer zones. Without the US funding the iron dome we would see a real genocide in Gaza.