>Apparently valuable enough to do a prisoner exchange for.

You don't do prisoner exchanges because of the valuable contributions of that agent, you do prisoner exchanges to ensure future contributions by other agents.

>I also doubt the quality of the optics in Russian satellites.

They're just fine. What kind of quality do you think they need to hit a power plant with a missile? Most of their missiles aren't that precise anyway.

There's only an extremely limited set of circumstances where drone footage of power infrastructure could be useful.