According to investigative journalistAnnie Jacobsen's exhaustingly assembled new book “Area 51”, Stalin enlisted infamous Nazi Dr. Josef Mengele in plan to crash UFO's in the Arizona desert to freak-out the Americans. The explanation for the famous "flying disc" that crashed in Roswell in 1947 is nearly as bizzare as the UFO theory. Jacobson writes that Josef Stalin inspired by Orson Welles' famous 1938 radio broadcast of War of the Worlds, wanted to throw the United States into a similar panic.
So Stalin enlisted Nazi doctor Josef Mengele, who had fled to South America after World War II, to create a crew of "grotesque, child-size aviators" to fly in a Horton Ho 229 plane the Soviets had seized from Germany. In exchange, Mengele would get a eugenics lab. Apparently the children, aged 12 and 13 and described by Jacobsen as having "unusually large heads and abnormally shaped oversize eyes," did not fly the plane; instead it was piloted remotely. But the Horton crashed in the New Mexico desert and authorities decided to hush up the incident. Quite the Rabbit Hole.