Russian KHL club SKA St. Petersburg has made the following announcement on its Twitter account:

“Forward Matvei Michkov is leaving SKA and will join the NHL Philadelphia Flyers in the offseason. The rights to the hockey player in the KHL are assigned to the St. Petersburg club.”

The club continued in the thread: “We thank Matvei for the years spent in the club system and wish him success in his future career!”

On the club's English Twitter account, a translation of a quote from Michkov appears: 

UPDATE: Eventually, the Flyers finally put out a statement from GM Daniel Brière: