Russia has confirmed that it will appeal against its four-year Olympic ban for manipulating doping data.
The Russian anti-doping agency, known as RUSADA, sent a formal letter on Friday disagreeing with the sanctions imposed earlier this month by the World Anti-Doping Agency.
The case is now heading to the Court of Arbitration for Sport.
Next year's Olympics in Tokyo will be the third consecutive games preceded by a legal battle over Russian doping issues.
RUSADA said it “disputes the (WADA) notice in its entirety," including the evidence of tampering with the data archive.
RUSADA's own CEO, Yuri Ganus, attached his own note of protest to Friday's letter.
Mr Ganus is critical of Russian officials and had disagreed with the decision to appeal.
The WADA sanctions ban the use of the Russian team name, flag or anthem at a range of major sports competitions over the next four years, including next year's Olympics and the 2022 soccer World Cup.
However, Russian athletes will be allowed to compete as neutrals if they pass a vetting process which examines their history of drug testing, and possible involvement in cover-ups at the lab.
Earlier this month Russian President Vladimir Putin had said that Moscow had grounds to appeal the decision and said the move violated the Olympic charter.
Russian Prime Minister Dmitry Medvedev has also urged sports organisations to appeal and said the ruling was “a continuation of this anti-Russian hysteria which has already become chronic”.