The dashed line means the path is a guess. When the plane stopped sending GPS signals, Flightradar draws a straight dashed line to the direction the plane was heading to when losing the contact, and continues the path on the same speed until the real location of the plane is known again.

And then the dashed line moves to go to where the plane has actually gone in that time.

So, the plane hasn’t been there, this is just how Flightradar reacts to the Russia’s GPS jamming.