Fiat money is only backed by the trust in the people who issue it and will back up that trust with their efforts.
Nobody trusts Russian government for obvious reasons and only an idiot would trust the Chinese.
Moslems can switch to the Yuan if they want, but they will become the same as the Ughars, slaves to the Han Chinese.
And after decades of using the Petro Dollar as a weapon, nobody trusts the dollar of America.