What a fascinating interview! I have been following these developments the last few months. Highly recommend anyone interested in this to watch. At this point, most every possibility is on the table with the exceptions of 1. a secret US technology and 2. optical illusions / tricking instrumentation.
A few new (to me) things stuck out:
1. He brings up the point that there are
theoretical possibilities other than 1. Visitors from another planet, 2. Optical Illusions 3. super advanced Chinese or other country technology.
For example, he mentions a theory that other dimensional objects that may live here with us, sharing common space at times, but are usually invisible to us. Whoa!
2. Many of these sightings in US and other countries have been around the world's nuclear facilities. He mentions at one point that it has actually interfered with the operation of a US nuclear facility. Other countries, including China, are forming groups to look into this phenomena as well.
It really appears that the US government is completely stumped by this. They seem to be saying that there are good reasons to look beyond the easy explanations (black Ops, illusions). At least that's what they want us to believe
While many are understandably cynical - and for good reasons - it is helpful to realize how our understanding of the universe around us has changed significantly in the last century or so, and we may still have much to discover that would fundamentally change it yet again.
Cool stuff to speculate on!