(Adds detail, quotes) By Jack Stubbs MOSCOW, March 11 (Reuters) - Russia has already done enough to meet anti-doping standards dictated by world athletics' governing body and reclaim its place at the Rio Olympics this summer, Sports Minister Vitaly Mutko told Reuters on Friday. Speaking shortly after the International Association of Athletics Federations (IAAF) declined to lift a doping ban, Mutko said Russia had done everything it was asked to and added that the IAAF criteria were unclear. Sing a song?" The IAAF said earlier on Friday Russia had "significant work to do" before it was reinstated, after a report by the World Anti-Doping Agency exposed widespread cheating and corruption in Russian athletics last year, igniting the country's biggest sporting scandal in decades. More...