I suspect that as an Irish airline, Ryanair will have difficulty securing UK-Russia traffic rights any time soon, but I await the day when MOL pulls some kind of publicity stunt in central St Petersburg to advertise some new routes !
Yes, currently Ryanair can only fly from Ireland to Russia (dependent on being granted traffic rights). Unless Russia agree an open skies agreement with the EU, or Ryanair set up a Russian subsidiary, it is unlikely they will ever be able to launch any routes from Russia to anywhere besides Dublin.