MOSCOW, Dec 19 (Reuters) - Russia's anti-doping agency RUSADA said on Thursday it would appeal four-year doping sanctions barring the country from competing under its flag at Top World News international sporting events, the Tass news agency reported.

RUSADA said it disagreed with the World Anti-Doping Agency's (WADA) sanctions, which would ban the country's colours and anthem from events such as the Olympics and World Cup, and said it will refer the case to the Court of Arbitration for Sport (CAS), Tass reported.

(Reporting by Gabrielle Tétrault-Farber and Maxim Rodionov, Writing by Alexander Marrow; Editing by Alison Williams)