I don't know if you have access to this book or not but I recommend it if you do. It's an actual scientific study of phenomenon very much like those drones in very much the same area. It attracted the notice of Avi Loeb and is now part of his Galileo Project. Good stuff in there if a bit dry. It's more a paper than a book and there are some surprising tidbits in there.
I guarantee most won't bother to read it but will still weigh in with an opinion on it.
There is a very long story that goes way back and that's a horse I've beaten to death here with little notice taken. IMO we are seeing is a mature iteration of a reconnaissance technology that has been under development for decades.
The drones themselves appear to be conventional tech. I agree with our government's statements up to a certain point: hysteria has inflated this out of proportion. People locally have told me with great assurance they have seen them, yet these are folks I know for a fact had not ever bothered to actually look up at anything and when they do they see what they have been conditioned to see. I have breakfast with one every week - at the airport cafe. I live near one and
do look up and indeed, there are all sorts of things to see but when you are used to them it's a different story.
Problem is there is a huge credibility gap. Without getting into politics we have good reason to distrust what we have been told and what our media reports. I also know the 'the government' is not homogeneous rather a huge collection of entities staffed by people loaded with the same human foibles we all have. They may not communicate, often one hand doesn't know what the other is doing. While some things are done very well others not so much. You sort of have to learn to read the chicken guts - look for trends and patterns rather than specifics.
You telling me something similar happened in China was quite a surprise and I will relish repeating it to anyone who might have an interest next time this topic comes up. Most people don't however so when I meet my friends who want to talk about drones it's just idle chat, we really just talk about restoring classic cars which is our main interest.