In science, the "easiest answer" is often the most likely. So
1)Testing of new technologies Could be American, Russian, Chinese... who knows. Missles, airplanes, drones, something along those lines.
2)Sometimes there are "weird" things that can happen. For example, radar has been known to erroneously reported multiple bogies, where in fact there was only one, and sometimes to report one, where there are none. Furthermore these phantom UFOs can do erratic and strange movements because they simply don't exist.
In science, the "easiest answer" is often the most likely. So
1)Testing of new technologies Could be American, Russian, Chinese... who knows. Missles, airplanes, drones, something along those lines.
2)Sometimes there are "weird" things that can happen. For example, radar has been known to erroneously reported multiple bogies, where in fact there was only one, and sometimes to report one, where there are none. Furthermore these phantom UFOs can do erratic and strange movements because they simply don't exist.