The novels - by Dmitri Yemets - are about an 11-year-old girl wizard called Tanya Grotter who wears round glasses and goes to a witch school called Abracadabra.
CBBC Newsround Online told you about the row back in September over Tanya Grotter and her Magical Double Bass.
Books must go
But now a second book's been published - Tanya Grotter and the Disappearing Floor - and JK's lawyers have given the Russian publisher till Sunday to take them all off the shelves.
But Dimitri says he didn't copy Potter and his stories come from old Russian children's tales.
He's even planning more books in the series.