I find it very hard to believe that the US, China, Russia, etc. could build craft with the capabilities the tic tacs have shown without some of the tech revlations becoming public or disseminated in some fashion. For example, you don't just go from the Wright brothers to SpaceX. There were intermittent advances in propulsion, aircraft engines, etc. that were developed over the years that. These craft demonstrate decades and decades of tech advancement.
If it was ours, why even release this stuff in the first place and come out looking weak because we can't stop them or say what they are? If we thought it was China/Russia, don't you think our course of action would be significantly more panicked? Our military has collectively shrugged. The only explanation I have for that posture is they know what it is and don't feel like its a threat.
And there have been hundreds of these sightings by our military. The partial vidoes that have been released of the tic tac encounters (parts of the videos remain classified) are only a very small amount of the recorded evidence the military has on them per the military's own admissions.