You should be aware that it is possible to direct your balloon pretty much anywhere by just changing the altitude.
If I was China and I wanted to make super advanced balloon to spy on US I would definitely make it so that it can use air currents at different altitudes to direct it where I want.
If I was China and I wanted to make super advanced balloon to spy on US I would definitely make it so that it can use air currents at different altitudes to direct it where I want.