Travelport and Amadeus have also stopped handling Aeroflot bookings but I'm a little confused. For a start there are other Russian airlines like S7 - I've not seen anything about anyone other than Aeroflot.
Then there's the Sabre PSS which is used by Aeroflot (which systems do other Russian airlines use - I think S7 use Amadeus Altea?). The Sabre release only talks about their GDS so are Aeroflot still using the Sabre PSS?