There is a number of Russian-language sources reporting salaries on the order of 200k to 350k rubles/month for an A320 captain at 90 hours/month. Pilots make less than captains, Aeroflot pays above average in the industry, and pilots of domestic aircraft (e.g. Tu-154) make substantially less than pilots of Boeings and Airbuses.
This article
Профсоюз требует с АК «Татарстан» свой процент reports that an average salary of a pilot at Tatarstan Airlines is 100k rubles/month ($3,000/month). Their 737 captain could have bene making 200k/month. 20k/month is completely implausible.
"This article cites an Aeroflot A320 captain flying 90 hours a month as making 400,000 rubles a month or $12K."
The article cites an intention to raise salaries to this level, which is obviously not the same thing as actually raising them.