You would do well to read the article, specifically: “WADA has been informed by law enforcement authorities that these attacks are originating out of Russia,”

You would do well to read the article, specifically: “WADA has been informed by law enforcement authorities that these attacks are originating out of Russia,” A quick google search of Fancy Bears (the name the hackers have used on their release page) links them to APT28: "APT28, as it's known by FireEye/Mandiant, is also called Tsar Team by iSIGHT Partners, Sednit by Eset, Fancy Bear by CrowdStrike, and Operation Pawn Storm by Trend Micro. This attack group goes after NATO, Eastern European government and military agencies, defense, and Russian adversaries, the report notes." WADA didnt investigate, the investigation is done by competent security analysts, and whilst I am aware that anything is this sphere is possibly misinformation/propaganda from both sides, it would seem evident that after Russia were sanctioned for doping, then hackers release data on suspected US doping that there is an easy link to make. And there is very little to be gained by another adversary trying to make trouble between the US and Russia with such an attack.