I agree with this analysis and I think your point about the main subjects of international diplomacy being state entities is very important, as is the point about Russia and China not being in a position to be “more Catholic than the Pope” as the saying goes, i.e. in this case they cannot come off as believing that they know better what is good for the Palestinians than the PA and the Arab countries of the region. That would be seen as very paternalistic and disrespectful.

China in particular has carefully cultivated a non-interventionist image, and made a point to emphasize the importance of respecting national sovereignty and not imposing from outside onto the people who are native to the region.