Originally Posted by
PHXflier
Rossiya is on Aeroflot's code share 2018 list (
https://www.aeroflot.ru/us-en/about/flight), so Aeroflot considers it to be a code share. For this reason, do not expect to earn Delta miles on Rossiya flights (if you do, then great!!).
However it depends on the type of codeshare. Ie if Rossiya is simply operating the flight on behalf of SU vs. operating their own flight and SU sells seats on their flight.