<span style="color: #222222;">The World Anti-Doping Agency said, it has asked the Court of Arbitration for Sport for a public hearing on its case for Russia's exclusion from international sporting competitions.<br />''<br />''WADA Director General Olivier Niggli said, it has made a formal request to resolve the dispute. He said, the dispute at CAS should be held in a public forum to ensure that everybody understands the process and hears the arguments.<br />''<br />''In December, WADA imposed a four-year ban on Russia over what it considers a state-sponsored doping scheme, prohibiting Russia from participating in such events as this year's Tokyo Olympics.<br />''<br />''Under the sanctions, Russians would be allowed to compete in the Tokyo Olympics only if they can demonstrate they were not part of the doping network.</span><br />