Graded readers are a good type of material for extensive reading. But how do you find graded readers in Russian? The English Wikipedia article graded reader has no link to the same concept in the Russian Wikipedia (see the "Languages" section in the left-hand menu).
Resources for learning Russian on Russian Language Stack Exchange does not list graded readers, and What Russian poet to recommend for beginners and intermediate learners? is not a good fit if you want to learn "normal", non-poetic Russian.
So are there any graded readers in Russian and how can I find them?