All fiats, in other words, including the Ruble, the Yuan, and the Real.

You may not know yet, @valued-customer, but Yuan is not fiat anymore. It has gold backing, and it can so far be exchanged with some restrictions: There are only two exchange services in China, and can be exchanged for gold only by a BRICS countries.

Ruble is also not fiat any more, because it is now energy backed – you can exchange it for gas & oil anytime. And it will also have at least partly gold backing, as Sergey Glazyev has explained:

@lighteye/bitcoin-newcoin-or-the-external-money-fallacy

His idea is (in my opinion) wrong because of centralization, but backing is not questionable. Yuan and Ruble are not fiat anymore – until further notice.