We have many examples of vehicles never operated by a country that is still going to that nation because they ‘considered’ it.
The best example of this to OP’s suggestion is the Mi-28A attack helicopter in-game in the Swedish tech tree all because it was flown by a Russian pilot in Sweden for testing and trials.
Yes, iirc we were told those two vehicles were exceptions. We’d see even more like the Soviet centauro or Freccia, there are many more examples, we could absolutely open up Pandora’s box with this idea, like an Italian A-10C or British M1A2.
Regarding the B1 Centauro as a Soviet vehicle because it was made trails. As you can see a lot of people don’t want it, and I have a certain personal point of view that can explain this negativity of a Western vehicle to the Soviet tech tree;
If Gaijin based their addition purely on the community’s interest, we would see a lot of this, where one side have more favourable interests and other not. I’m not oppose to the Mi-28A, just think it’s blantant the bias of the same helicopter in another tech tree with the same 9M120 ‘Ataka’ ATGM, in, practically same platform but a 0.3 BR difference from the earliest Mi-28 in Soviet tech tree, the Mi-28N.
Personally I’m against this suggestion, also, I doubt Korea are going to Japan, Thailand is more favourable.
Italians never tested the A-10C. That was an exchanged pilot.
That means the Italian Government never directly considered nor ever thought of purchasing or requesting to purchase one from the US Government and Military.
South Korea however requested the changes and tested the Helicopter. Context matters.
Which none you have implied. Going by Gaijin rules they wrote. This was tested and the changes are substantial enough to be added.
It’s the same rules that would apply for the Korean T-80 MBT’s.
While russia does not need it, it should ONLY go to russia if at all implemented. It was never adopted by SK nor was it really deemed for adoption into the SKAF.
Plus as OP states, it was later stripped of all western equipment and remains Russian property. Even sporting russian colors and flags. hence +1 for russia only but id rather not see it