If you’re curious,
- Why is the Oil traded in USD ?
- Did any country tried to trade Oil in any other currency ?
- What will change if Oil starts trading in RUB (Russian Ruble) ?
Check this site from Anas Alhajji
https://www.anasalhajji.com/publications/opec-and-the-oil-market/opec-continue-price-oil-dollars
Cheers!