Lada was the top-selling brand in September, rising 12 percent. Second-place Kia rose 6 percent, while sister brand Hyundai was up 15 percent. No. 3. Renault rose 5 percent in fourth place and VW rounded out the top 5 with a rise of 12 percent.
Skoda sales jumped 31 percent.
Nissan was down 24 percent, Mitsubishi fell 18 percent and Toyota sales dropped 10 percent.
Sales through September fell 14 percent to 1.09 million vehicles.
The third quarter fall was 14 percent year-on-year, but the AEB was optimistic the overall sales decline in 2020 would be less severe than feared as Russian businesses face fewer restrictions from the coronavirus pandemic than earlier this year.
Staertzel said the 2020 forecast was a 13.5 percent year-on-year decrease, with expectations for 1.5 million units to be sold.
In July, the AEB had expected a 23.9 percent reduction in sales in 2020, to 1.3 million units.
Reuters contributed to this report