I thought that was because Saudi Arabia doesn't call them refugees but "Arab brothers and sisters in distress". The number of such people is quite contentious,

I thought that was because Saudi Arabia doesn't call them refugees but "Arab brothers and sisters in distress". The number of such people is quite contentious, if https://en.wikipedia.org/wiki/Syrians_in_Saudi_Arabia https://en.wikipedia.org/wiki/Syrians_in_Saudi_Arabia is any evidence. There may be 500K such people "in distress." FWIW, unlike the EU countries, Saudi Arabia isn't signatory to the United Nations Refugee Convention.