So a 13-year-old girl declared she was gang rape. A journalist picked up the story and some Russian TV channel talked about it, without making sure the rape was real. This kind of sloppy journalism is common everywhere. I live in Quebec and here absolutely all mainstream media will do it (the only difference is our media will hide the ethnicity of the alleged rapist if he's black or Muslim).
Then Russia's Foreign Minister made a comment implying the German police could try to minimize the case to protect asylum seekers. Considering the German police did exactly that after the Cologne attacks (as well as other multiple attacks in other German cities), also considering that the police admit it was at least statutory rape, yet try to minimize this as "child abuse", I'd say the comment was justified.
Then, the BBC decided to use this story about this sloppy journalism and a somewhat legitimate comment from a Russian Minister to try to spin it into some kind of "Russian propaganda".
The truth is this article is an example of anti-Russian propaganda, not an example of the supposed Russian propaganda. This BBC story is an example of the typical "fake news" that plagues our mainstream media. And the fact that you can't see it is frightening.