[This has been also asked on another site] I'm just curious:
It is been claimed here that the requirement of having renounced your current citizenship to get German citizenship can be accomplished by simply applying to your current government to renounce your citizenship. The user suggests that, to the German government, whether Turkish government allows you to renounce your citizenship or not is irrelevant, meaning that, during the German citizenship application process, even if you provide them with your renunciation application form with a big "Denied" stamp on it, the German government will consider you a stateless person, hence allow you to become a German citizen (provided that you satisfy all the other criteria).
First of all, does this true? Can you give any formal reference?
Secondly, does this mean that, after "renouncing" your citizenship, can the same person apply for a stateless person (grey) passport from the German government?