MOSCOW, Feb 12 (Reuters) - Russia’s Central Bank Governor Elvira Nabiullina, asked about the recent frenzy of Reddit-fuelled retail trading, said the bank was looking into it and highlighted that restrictions for non-qualified or non-professional retail investors were important. The U.S. retail stock trading phenomenon driven by the WallStreetBets Reddit forum is now fuelling a copycat trading boom in Europe, banks and brokerages have said.