Interesting idea, and strategically valid, I do believe, at the condition that the owner is the only entity that can give it the marching orders. But that is an issue for the spymasters to resolve.
The real issue is that orbits degrade. If you want a loitering anything, you need to include the necessary fuel and exhaust ports, plus comms and telemetry to know how high it is, how fast the orbit is degrading and when and how long the burn needs to take to recover an optimal amount of time before the next burn.
Given that there is currently no satellite in existence that can maintain orbital altitude on its own (even the expensive telecommunications satellites that are very valued by their owners and would certainly benefit from such technology), I'd venture that, if Western economies with their ready access to best-level physicists and boatloads of money do not include such tech, I highly doubt that the Norks have the brainpower, not to mention the resources, to do it on their lonesome.
But hey, ingenuity knows no bounds, so I'm willing to be surprised.
Biting the hand that feeds IT
