Someone said something about spotting Nazi UFO craft around New Schwabenland. How they would have had that kind of technology means they must have been in cooperation with some higher power. I don't know why an alien species would want to keep contact with us.

They would have a malicious intent and must have seen the Nazis as a positive force. The lines get pretty blurry at this point and it is basically impossible to say.

Maybe, just maybe the Nazis found some old remains of a blue-print for the design and way to work and build a UFO somewhere in Russia, which is where I would expect it to be, since such secrets might have been known by the Bolsheviks, but they were too stupid to make it possible.