Genuine question from someone who knows nothing about these types of things.
If a plane is in the sky without permission/approval, does it show up on Flightradar? Ie is it the radar that picks them up and then they are shown. Or is it an illustration of all the planes that have told 'the authorities' they're flying?
What happens if someone just takes off and tells no-one? I think this is where the military come in?
So while the OP seems to be suggesting that either this plane is Putin going over to duff up the Yanks, or to say 'you know what, I CBA with this any more, I'm going to live out my days on a beach in Borneo', what's really going on here?