That would be a pretty cool plot twist as weird as it is.
If this was the case, i think there would be some Intel that Russians were involved. This would probably be a huge incident and not a hush hush alien story. Plus, Anna would say that this happened before (her grandma would tell of their men being skinned and mutilated). I wonder if all of this could be tied up, even loosely, to Russians. Let’s say they had cloak tech and were using or testing it.