He publicly doesn't get along with the CSKA coach. The guy benched him during the playoffs, and said he wouldn't recommend Shumakov for the Russian National Team. He's holding out, either to the NHL or another KHL team.
CSKA's ask has been ridiculous to other KHL teams in a trade. There are only another few teams in the league who could afford his salary. From what I've read, they are asking for other teams best player in exchange for Shumakov, which is completely unreasonable. Based on the quotes coming out of CSKA, it doesn't seem like he'll be back with them. So there is definitely an incentive to get rid of him. I guess it matters what CSKA could get for him in a trade. If its a lot, I doubt they'd agree to terminate his contract. If its not much, would they take very little in a trade or agree to a termination if thats what Shumakov preferred?