This is mainly for fun, I know this will never happen:
Here is the article I read about it: Rysk politiker vill införa euron | Näringsliv | SvD
(If anyone is really interested, just run it through google translate, it's in Swedish).
The name of the person in question is Mikhail Prokhorov who is a politician (what party?) and oligarch, according to the article. What do you know about him?
Basically he is saying that Russian participation would guarantee the future of the Euro and it would create a kick-ass economic zone from the Atlantic to the Pacific (move over, the dollar...!) Also from the point of view of Europeans, it would be a situation of "better the devil you know" - it would be better to work with Russia than to have China step up if/when the dollar sinks.
I just think it's a cool idea, but obviously I realise that Russia hardly could not be in the Euro since it's not in the EU, does not qualify to be in the EU (and probably doesn't want to) and because the existing EU members to varying grades are relatively paranoid and suspicious about Russia.
Also, I think that Russian media is exaggerating the problems with the Euro, it's not quite as bad as they make out. Germany and France are totally committed to it, they seem prepared to stop at nothing to keep it working. It will only fail if the ECB, Germany and France totally fail at one of their main political priorities.
From watching Russia Today a bit recently I have noticed that there is a lot of interest in the Euro in Russia. I had not realised Russia cared massively about either the euro or the EU in general. I thought Russia didn't take either very seriously.