[FpUser]

If they buy from Russia / China they will and do.

[jopsen]

As recent as a month ago, they made a deal on gas settled in euro.

https://www.reuters.com/world/asia-pacific/exclusive-russia-...

Doesn't that say something about them not trusting each others currency?

Would you trust the yuan? Chinese people can't exchange to other currencies freely, or transfer money abroad. It's effectively held up by a captive audience (subjugated people).

[FpUser]

From what I know they trade in multiple currencies including yuan.