Rio de Janeiro set to host 2016 Olympics . WADA chief warns Brazil over Olympic construction delays . IOC vice - president says security on the ground is ` ` critical '' John Coates says state of affairs worse than Athens in 2004 . Brazil currently preparing to host 2018 World Cup .
Rio de Janeiro set to host 2016 Olympics . IOC vice - president says security on the ground is ` ` critical '' John Coates says state of affairs worse than Athens in 2004 . Brazil currently preparing to host 2018 World Cup .