They have. Currently their Crude Oil is sold to India for very cheap and discounted prices, then India sells them to Europe, China, and anywhere where it's needed. Because India took the risk, they're making billions from Russian Oil trades. I believe India is using the Ruble for their trades with Russia because they can't use the U.S. Dollar.
If that fails, they could use Gold. But if THAT fails, they could use - ?
If all else fails, sanctioned countries could use Bitcoin. It's said that some government officials from sanctioned countries are already using the cryptocurrency. They could easily buy/sell BTC in a P2P/F2F manner. This allows them to skip centralized exchanges (which are compliant with sanctions) altogether. If Bitcoin was centralized, none of this would've been possible.
Sanctions are just an spectacle from the West. Eventually, western countries will "shake hands" with Russia as if nothing ever happened. That's the hipocrisy of politics. The ones who ultimately pay the price are none other than civilians themselves. Who knows what will happen in the long run?
And once they truly understand Bitcoin's value-proposition, its nature, and therefore its POWER, they might buy as much Bitcoin as they can afford. It will be like that time when merchants and purchasers of the Dark Markets discovered that what they needed was Bitcoin during 2011 but for different nations/governments.
It could start the "Bitcoin Race".