Doraemon: Robot War (partially found bootleg anime film; 1983)
From The Lost Media Wiki
Doraemon: Robot War (小叮噹大戰機器人) is a 1983 bootleg Doraemon film created by Cuckoo's Nest Studio (now known as Wang Film Productions).
Information on the film is extremely scarce, and the only proof of it's existence is an entry in a Chinese blogging site called Roodo, containing several screenshots and one clip of footage from the film.
It is unknown if this film was released in theaters, released on home video, or both.