It won't work. I mean bitcoin is great and all but Russia will not be capable of spending 10 billion dollars in bitcoin for anything of value, what are they going to do book hotels on Expedia and get the money back to their country ? The problem is not what money they use, it is the sanctions that do not allow them to do shady stuff and as long as they want to use money on shady stuff bitcoin is as close to as possible but at the time of cashing out it will still create a problem
To make things clear, I totally agree with your view
With that said, though, it can be said that Russia is going to buy Bitcoin as they see and appreciate its true potential as a future unit of account in international trade as well as a universally accepted and highly valued store of value (on par with or even exceeding gold in this role). This sounds kinda implausible or impossible to you, right? So what are you doing here then? I guess you can't have it both ways, i.e. to value Bitcoin high personally and refuse this option to someone else or some other entity. Or, maybe, you don't actually believe in the stories you are telling (note that I don't mean you personally, of course, so no offense should be taken)
The day USA decides to freeze all assets of certain dangerous Russian people even tough whoever decided to freeze the assets will have their life on the line for such a thing it will also stop Russia to do shady stuff like they did with NRA. They literally got into an important NRA level position and gave money to shady politicians, this should always be held accountable and bitcoin won't help them on that.
This is not a politics board, but while we are at it, Russia isn't doing anything what all other nation states (including the US) haven't been doing for centuries