There is at least one regiment of Su-27S still operational with the Baltic Fleet AVMF. There is at least one squadron of Su-27S with the Khotilovo airbase. There were two squadrons of Su-27S/P at the Krymsk airbase before the SM3s got there. It's unclear whether they were retired, relocated, or left there. In December 2010 there were 1-4 squadrons of Su-27 part of West MD, in the 7000th Airbase, however where their physical location is, is pure speculation. And Khotilovo is now part of the 7000th AirBase, so it's unclear if the other Flankers in West MD were retired or not. There is also Su-27s at the airgroup deployed to Kant, Airbase 999. However there should be ~4 there.
Nobody knows how much the PAK-FA would cost. Some Super Flanker variants do run closer to 60 million, so it wouldn't be inconceivable to sell a MiG-31BM for that money. That having been said, it's very unlikely there are any real current prices for the aircraft, given how it's not getting exported, or produced at this time. So I'd disregard those numbers.
Speaking of MiG-31BM, the GPV-2020 apparently has 60 more MiG-31s getting upgraded. Anywhere between 24-48 should be already BMs, so this means that large quantities of MiG-31s will remain in service past 2020.
http://lenta.ru/news/2011/12/30/mig31/
Also the first An-140-100 has been delivered, out of a contract for 9 of those aircraft. The production is done at Aviakor factory, in iirc Samara. It's a replacement for the An-24, and An-26 medium transports. Given the rather poor state of Aviakor, they are unlikely to be able to truly mass-produce the aircraft, but they should be able to deliver 3-5 aircraft annually. (they themselves claim to have production facilities for 6 annually) The other problem is that they also have orders from Yakutia airlines for the plane, and they do repair and upgrades on Tu-154 airplanes, as well as low-rate production. So realistically, without major investment into the plant, the MoD would be lucky to get 3-4 aircraft a year.
http://www.arms-tass.su/?page=article&aid=102289&cid=25
http://www.arms-expo.ru/049057054048124050054051050055.html