Ukriane didn't just build hulls, they also fitted out the ships defensive weapon suites as well. They have the shipbuilding navigation and comms equipment (Belarus) capability to. The only thing they don't have is the actual SSMs and aircraft the aviation cruisers carried. PLAN already has the aircraft and they will probably dump the SSM capability.
Big-E, its not that I disagree with you, but that the situation is vastly more complex 'on the ground' then it is elsewhere.
For example if a supplier of system X in USA signs a contract to supply to USN, it then assembles a bill of materials required to assemble the system, directs its purchasing people to source components of required specs and commence production. Most such component makers are, or need to satisfy USN/DoD standards of manufacture, and are pretty much predetermined.
It was same in FSU, but not now.
The component manufacturers are all over the place, and many have changed their production to what they can sell, and this does not satisfy previous Soviet Navy standards, and in some cases the NATO standards either. If this affects only say 10% of componentry, the system's performance in question is already compromised, but what if this happens on a greater scale?
This is the every day issue that all FSU engineers have to deal with on daily basis. It is likely that the example you gave is related to this and not Gazprom issue. This is entirely the reason Russian government has retained stake in many producers, and so has Belorus for that matter.