The Russian Athletics Federation has been given an extension to respond to charges that its officials obstructed an investigation into a drug-testing whereabouts failure.
The Athletics Integrity Unit announced on 21 November that RusAf had committed "serious breaches" of anti-doping rules, and that its officials "had been involved in the provision of false explanations and forged documents" to the AIU.
Responses to the charges laid were initially asked for by 12 December, but the AIU has confirmed that this has been extended until 2 January.
The AIU said in November that a number of officials, including RusAf president Dmitry Shlyakhtin, who has since resigned, along with the athlete Danil Lysenko and his coach, had been charged with tampering and/or complicity under the anti-doping rules and had been provisionally suspended.
The charges were brought after a 15-month investigation, which was conducted with the assistance of Russia's national anti-doping agency RUSADA.
Lysenko, 22, won a silver medal when he competed as a neutral athlete at the 2017 World Championships in London, with the Russian federation having been suspended by World Athletics since November 2015.
Lysenko's neutral athlete status was revoked by World Athletics last year over the failure to provide whereabouts information.
