As far as getting DL miles, it depends. If it is operated on behalf of Aeroflot then yes you'll earn miles. If however it is a Aerflot codeshare operated by Rossiya then no. In the first case, Rossiya is simply providing a plane and crew for what would otherwise be an SU flight. In the latter, Rossiya is operating their own flight and Aeroflot is selling seats on it.
This is just like AF coded Cityjet flights.
From whay I can see SU6285 is simply operated on behalf of SU by Rossiya, thus get credit.