Data bases can be provided by friendly countries, the Iranians have relied on this for years. Obviously the copy is unlicensed and hopefully gets a very careful checking. Russian computer hackers are quite skilled and encryption would be at commercial level rather than top grade military.
Any aviation authority in a country that Russian Airbus or Boeing aircraft operate to should be taking a close interest in the airworthiness of these aircraft.
Thai Airways operate the same types and most of their fleet is grounded at the moment and parked in lines at BKK, with quite a few unlikely ever to fly again. While this is Thailand, I wouldn’t for a minute suggest that these aircraft or the company’s spares holding could be used to keep Russian aircraft flying. Sanctions would be properly enforced.