Let us know that these are two seperate means of exchange for goods and services. National Currency anywhere will always be an identity to represent a country; a mean of payment for goods and services usually in form of cash. But Crypto does not belong to any country or region. The same ethereum or Bitcoin used for transactions in Japan is the same used in Russia.
The fact that cryptos are decentralized makes them not depend on any country or anybody. It means that there is no any center (like corrupted central banks) that controls the currency and maniupulates it.