Aeroflot has been trying to keep its Airbus and Boeing fleet in the air despite a western parts embargo (including Airbus and Boeing) due to the illegal invasion of Ukraine by Russia.

Apparently Aeroflot is now sending its western-built aircraft to Iran for maintenance.

According to the flight tracking system Flightradar24, an Airbus A330-300 (RA-73700) flew to Tehran on April 5 and remains there until now, presumably for maintenance.

More on how Mahan Air circumvents the parts issue:

https://www.cirium.com/thoughtcloud/ascend-by-cirium-weekly-team-perspective-can-aeroflot-use-iran-maintenance-capability/

More from Reuters:

https://www.reuters.com/world/russias-aeroflot-sends-aircraft-repair-iran-2023-04-11/