[Apologies to mods. I tried to the edit the above post and I seemingly do not have permission to do so.]
I have to make my first post at some time, so what the hell.
I have no special knowledge of Chelsea finances, I took the liberty of asking a friend who works in the financial markets (not as a bank manager, either) what he thought and his response was basically, and I'm paraphrasing here: "Abramovich is very secretive but from the little I do know I'd be very surprised if he has much money denominated in roubles beyond that which he needs to tithe the Russian state and keep the Kremlin off his back... He [Abramovich] started in the game as Yeltsin's bagman and lived through the last Russian default (1998) do you think he doesn't know how to move money? What century are you living in? He's laundered most of it through London a long time ago."
He's a Spurs fan so we have to forgive him what he does for he knows not what he says...
He made a very interesting point that the collapse in the rouble isn't all about Russia, it's much bigger than that. Russia is a double whammy as its susceptible to sanctions as well as the collapse in the oil price. The example he gave me was Saudi Arabia's stock market that has suffered a twenty per cent hit recently. This could hit the Qataris too eventually.
FFP is almost an irrelevance considering the amount of money in play. He pointed me here, amongst other places, and I think it's a good read: http://weaintgotnohistory.sbnation.com/2014/11/13/7214597/chelsea-finances-future-ffp-fair-play
He went on to mention some stuff I find very interesting but probably isn't relevant here, though I'm more than happy to post if you like.
TL;DR (and I don't blame you): Will it effect Abramovich's ability to fund Chelsea? Short term: no chance. Longer term, unlikely but who the f**k knows?