Ufo’s are an overlooked issue of our time. I believe they are demonic in nature and have to do with the evil forces as mentioned in Ephesians 6:12. I recommend to read Kelly Cahill’s book Encounter or watch the movie Fire in the Sky by Robert Lieberman. This movie is about the Travis Walton abduction. Lynn Catoe wrote that the gray aliens are demonic in nature,

https://www.governmentattic.org/13docs/UFOsRelatedSubjBiblio_Catoe_1969.pdf

A Russian story: https://www.wandstore.ru/alien-detour