The International Ice Hockey Federation (IIHF) filed an appeal against the decision to reinstate Russia's participation in the competition. Reuters. The claim was submitted to the Court of Arbitration for Sport (CAS), which previously overturned the ban on the participation of Russian teams in the next five world championships. The Athletic and TSN reported that the lawsuit is based on the concealment of ties to Russia by two of the three CAS panel members who participated in the decision.