Got money to hide? Try Austria, Lichtenstein, Cayman Islands, Jersey, Isle of Man, Bermuda, Curaçao, and keep it moving. Best of luck. Talk to Bill Clinton.
There are also the super secret Muslim money shifting networks that date from medieval times, Chinese 'banks,' etc. etc. Know nothin' about them ... but sure would like to.
I don’t think Saudi banks cooperate with IRS.
Of course, if you’re a politician and you hide your money there, they own you I suspect.
And like you, I suspect Chinese banks probably do not cooperate either. With the same proviso for politicians who keep their money there.
I seem to recall Clinton expended a lot of energy going after banking secrecy in all the usual havens, Panama, Caymans, Switzerland, but never Saudi Arabia. So I concluded that that was where he kept his money. (I know, that’s just me).