Who would have thought a balloon is not useful for spying. You have little to no control over its direction, it isn't discrete, and most silly of all, why use that when you have satellites?
I guess the US was outwitted by a balloon after spending billions of dollars on cutting edge spy planes and powerful satellite cameras.
This would create quite an evil mouse. I imagine the risk here is that the mouse would break free and run away with the ring and bring it to Sauron.
Edit: Someone already beat me to it.