Things started in 2017 with TTSA and the Pentagon's acknowledgment of a series of videos regarding craft that showed strange movements of a unknown craft[1]. The fact is there is a pentagon program looking into this phenomenon, whether they are a psyops organization designed to deceive or mislead the public or a genuine org that is fact finding is yet to be revealed.
Couple that with the acknowledgement of a series of fantastic technology patents that show off technologies not known by mainstream science by a engineer in the Navy [2].
Even more interesting is some of the technology in the Navy patents(room temperature superconducting) has recently been shown to be feasible(although with strict environmental controls) by MIT [3].
I am uncertain what is going here, If these craft are indeed genuine my suspicion is the Govt has made a lightspeed advance in technology and these craft being seen are products from a unknown skunkworks, if that is not the case than possibly China has made the leap. If they are not genuine, then the US is running a brazenly deceptive misinformation campaign with the media(and China). The other alternatives which would be a truly unknown source, or a known extraterrestrial source. The last two being least probable.
[1] - https://www.nytimes.com/2017/12/18/insider/secret-pentagon-u...
[2] - https://patents.google.com/patent/US10144532B2/en [2] - https://www.thedrive.com/the-war-zone/28729/docs-show-navy-g...
[3] - https://www.technologyreview.com/2020/10/14/1010370/room-tem...