necessity of visa for SVO transit
even though I believe the Delta info available to GA (from Timeatic) says visa required for transfer from SVO2 to SVO1, there is a sterile transfer available (they collect the pax and drive a van across the runways to the other terminal). So, if you are will to risk being denied boarding for lack of Russian visa, you can transit at SVO to CIS destinations without an (expensive) Russia visa.