As others have pointed out, the people being dismissive on this thread are almost entirely ignorant of everything there is on this subject. Anyone calling these drones is talking from a place of 100% ignorance. The vehicles bounce around like ping pong balls in whatever direction they want to go with no acceleration or deceleration; they just simply move and stop, and they can move at speeds FAR beyond anything we can produce. Not only can we not produce it, but even if we could, the way these things start and stop would kill any living thing on board due to the g forces produced. The vehicles can also apparently "fly" underwater with zero problem and go in and out of water with zero problem. Whateverttjey are, they are centuries of not millennia beyond anything we currently have. The chances any other nation is that far beyond the US is very close go zero.
What I think is interesting is that there's ar least one video showing these things flying "belly first" when it really wanted to move quickly, which is exactly how Bob Lazar said they flew, and he said this before the video was leaked. That's pretty strange.
Again, there are now numerous, very reputable people saying these things are real, it's essentially impossible they're of human origin, and we have had numerous encounters with them now, many of which we have videos of. The videos that have been released are stated to be the least compelling videos we have, and apparently we have videos of the things from as close as within 50ft. Again, people saying this stuff includes actively serving US senators. It's not tinfoil hat stuff.