when crypto is used as fiat, any economy can survive.
i think that's the next step that economies will need to take. adopt cryptocurrencies -- accept crypto payments for goods or services rendered.
traditionally, we use fiat to acquire what we need. to facilitate trade where the local fiat has almost lost is value, cryptocurrencies will prove beneficial. let us not forget that we have stable coins whose value is pegged against the us dollar so anyone's buying power will not be undermined.
the problem though will lie on wallets when internet service is unavailable. how do we get p2p verified transactions without internet service....
What about when crypto is used as an asset as an alternative to stock, will that work too? I think it is. Local stock market are often times crashing but not crypto as they aren't have a direct connection to each other but it's best if crypto is used as a fiat, not only it can help fight inflations but it makes people get familiarize with it.
Crypto won't save Russia from sanction because the problem isn't only about currencies or finances but there's also a problem about the goods, they can banned or they can't export/import. Cryptos are decentralized and anonymous so I don't think it can be blocked or it's possible to know that the address are from the government.