China would help Palestinians the most by actually getting inwardly stronger, and dealing with the final, decisive blow to the US empire in a few years during the incoming hot war in the Pacific against it that the US would initiate. At that time, the US would shatter like a glasshouse, and you would have Palestinians and the rest of the Muslims around Israel slowly salami slice it out of existence slowly afterward, just like the Zionists tried to do to the Palestinians all these decades. Their nuclear capability will save them from immediate destruction. Still, settlers will all be indirectly forced to emigrate slowly over decades in the post-US world order as they would have no more weapons, or money, to gain from the US/West to live by. Iran's power would also go up parabolically in that world without any sanctions, all Arabs would turn totally against them, there would be constant tensions, missiles flying over their heads, inner socio-political collapse, etc. Over time the Zionist citizens will therefore once again slowly disperse into the wide world from the so-called Israel. Most aren't even native to those lands and are from other countries in the first place after all. Until then, China will do its best to help Palestine diplomatically, facilitate political reconciliation, slowly set the stage for the eventual Palestinian state, and help Iran technologically and economically, which will in turn help Palestinians survive till then.