Russia has become the master of denial in recent years. From military incursions to hacking to assassinations, the Kremlin has sworn blind it's not involved. But now the country's athletes are waiting nervously, facing sweeping sanctions for another doping-linked scandal, and senior officials are keeping their silence. There is one, striking exception. Yuri Ganus has been warning for months that Russian sport stands on a "cliff-edge" and needs to radically clean up its act. For that, the head of Russia's anti-doping agency, Rusada, says he has received pressure and threats. "Threats or not, clean sport is my mission," Mr Ganus told the BBC, in offices whose corridors are hung with messages of encouragement for a reformed Rusada from other anti-doping bodies around the world.