Hamas has been getting along with Moscow more and more in recent years
As for BRICS, remember that BRICS recently invited Iran and Saudi Arabia to join. Both OPEC nations are competing with each other for regional hegemony in the Persian Gulf (Iran is a major backer of the Houthi rebels in Yemen which Saudi Arabia has been opposing for quite some time). As Iran is an existential adversary to Israel, there is a potential geopolitical advantage for Saudi Arabia to come down on Israel's side.
Of course, the picture is muddled by Iran being Shi’a Muslim and Hamas being Sunni, which ideologically aligns more with Wahabbist Saudi Arabia, as well as Egypt’s past support of Israel against Hamas.
The political and ideological fault lines in the Middle East have never been as bright and clear cut as the prevailing narratives suggest. Anyone trying to game this situation is almost certain to get it wrong in at least some major respects.
As for Israel's ability to survive this conflict, it is a country which has been battle tested more than once. I would not be quick to count them out. There is a certain military advantage in being a stiff-necked people.