It pulls troops away from the eastern battle zone.
That works both ways. How do the Russians benefit from that?
To be a benefit, it has to be a fake movement, somehow having the Ukrainians believe there is more force there, than there really is.
This war is the most open, ever in history. Both sides have access to multiple platforms of drones, aircraft and satellites.
Deception is hard, and necessary.
That will give Vlod's Azov & NAFO puppeteers some pause.