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They don't trust each other (e.g. India vs China) and each other's currencies. That's the real obstacle here

There is only single available solution here and its name is:
Bitcoin :)

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Yes. But before they'll go back to antiquity with a wholesale currency backed by gold

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Bretton Woods (i.e. between countries that theoretically had a "trust" to each other) - assures us that in case of BRICS their potential gold backed currency - will be a very short-term episode ;)

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But it will be backed by energy. Could be different

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please be serious... ;)
BRICS issued paper money "backed by energy" - will be like Petro in Venezuela:
https://www.fintechnexus.com/venezuela-petro-cryptocurrency-backed-crypto-the-petro/
I give them not more than 5 years, too :)

There is only single currency in this world that is backed by input energy:
https://medium.com/capriole/the-energy-standard-b726edeed588