MasteR
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Perhaps they were hoping to hit Inar?
Added 5 minutes later
Does anyone remember how complex Revan's clues are and what principle they follow? Because from the riddles, the only thing that came to my mind was "the Red Book of the Russian Federation" (the cross means extinction, the red background indicates the book, and hugging the tree means caring for nature) -> "National Reserve" -> Policeman. But it sounds a bit too simple, to be honest.
Apparently, the real difficulty lies in finding the right starting point. I like the train of thought, but it seems like Policeman was already ruled out.