A non-US actor would be interesting indeed, and it's also more likely than ETs.
However, let me point out that this:
> The news is that the US military is acting very much like they aren’t responsible for recent sightings
... has multiple prosaic interpretations that are also relatively likely. To name a few:
- "The news" is not the US military. You have at least one level of indirection there.
- The US military saying something doesn't make it what they truly believe. Disinformation is a real military thing. Even disinformation aimed at a third party (e.g. rival nations who could believe the US military is asking its own population [things]).
- Inter-agency rivalry is a thing. Top secret projects may not be known to everyone within a military.
- Drones are now widespread, so the US military encouraging the usual UFO believers to be on the lookout may help them spot actual threats. It doesn't have to be anything physics-defying, just true unidentified flying objects.
- Finally, though less likely in my opinion, it could be the US military believes in UAPs of physics-defying or even ET origin, but it's just another case of Men Staring at Goats. I mean, in their history they have believed all sorts of kooky things with zero backing evidence.