List of high-altitude thing incidents in 2023

In 2023 there have been some (notable or) famous events at high-altitude; The things (or objects) involved, have been a danger to airspace security.
The incidents are:
In February 2023, the United States government said that those things that were shot-down by the United States, were not (alien spacecraft or) a kind of Unidentified flying object (UFO).