We've just had a bit of fundamental honesty for once.
They US State, with all it's power and faculties, can not offer precise explanations for a lot of these phenomenon. This is exactly why they have always refused to acknowledge the fact they accept them as credible in the past. It posed enormous difficulties for those charged with maintaining national security
"What are these things in out aerospace, over our sovereign territory, that display technological capabilities far in advance of anything we know?"
"Err sorry, we have no idea. Probably best for all involved we just refuse to acknowledge it publicly".
All that has happened now is that they are finally putting their hands up and admitting 'sorry public, yup, these things happen, and we're as puzzled by it as you are. If you want explanations, sorry, but we don't have any".