You forget that Russia is under heavy sanctions (which likely lead to the accident in the first place), and they have a difficult time maintaining their normal planes, let alone those that crash land or take off from fields
According to https://www.planespotters.net/airframe/airbus-a320-200-ra-73..., the plane was leased from AerCap and registered as VQ-BFW (Bermuda) until 23 Mar 2022, and then re-registered as RA-73807 - so yes, this is one of the stolen planes. But the spare parts situation is not related to that...
I have found an article https://www.reuters.com/business/aerospace-defense/aircraft-... about AerCap receiving 645 million dollars for 17 (or 18?) aircraft used by Aeroflot, but Ural Airlines being independent of Aeroflot, I don't think this plane is part of that agreement.
Officially, no. In reality there are ways around it. There are always local or Chinese knockoffs, and other aircrafts that can be used as sources of spare parts. This one might well end up like this if too many things go wrong. Itβs obviously suboptimal and a bit of a gamble.
