Cameroon star Samuel Eto'o has become one of the world's highest-paid footballers and the biggest-ever signing to a Russian club.br br But Eto'o may face challenges on the pitch, as Russian football is plagued by racism.br br Many Russian clubs have ultra-nationalist and neo-Nazi supporters who are particularly averse to players of colour.br br In June, a Brazilian player had a banana thrown at him during a game. The fruit has become emblematic of racism in Russian football, and there is talk of banning it from games as Russia - to host the 2018 World Cup -searches for a strategy to fight racism. br br Al Jazeera's Jonah Hull reports from Moscow.