The estimated 20 million people that died during Stalin’s purges could not be reached for comment.
It was much more than 20 million since he never kept records of his victims.
An article about North Korean views of Stalin. (Stalin literally installed the Kim Il Sung regime in the 40s. Decades earlier, he had purged Koreans from mainland Russia.)
https://www.nknews.org/2016/01/the-image-of-stalin-in-north-korea/