I can’t really understand what the problem is. How is floating a weather balloon/surveillance balloon over someones airspace any different to having surveillance satellite in a LEO?
I’m pretty sure that if it is >FL600, the there is very little risk. After all, i’d have a guess that the US overflies many other countries >FL600 with both manned and unmanned surveillance systems.
Now, if sovereign airspace had a internationally recognised vertical limit, then this incident would be different.