In some senses, it is difficult to see why a sanctions attack against Russia would damage their currency that much. The fundamentals are still much the same. I still bought US products after Iraq and I'd still buy Russian products after Ukraine. I imagine most of the world feels similar. There are even some hints that parts of Europe feel that way.
Although, because I'm something of a gold bug, there are some unreliable claims they've re-introduced the gold standard (https://theconversation.com/why-russia-has-put-the-rouble-on...). That is an interesting thing that happened on the way through.