it was set in 1983, the same year Demogorgons appear on Stranger Things (Netflix series). The alien parasite symbiote really looks like a Demogorgon at first glance. Maybe they are the same or related to each other? Also, the Russians in ST season 3 are experimenting with these creatures as well to use them as war weapons - exactly the same mission with the Soviets in Sputnik. Furthermore in ST, the monster used to live inside a boy's body (Will Byers), the same as what happened to Konstantin in Sputnik... now we know these creatures come from space and have their own world in our Earth called the Upside Down.
Question: How to separate Konstantin from the creature without killing himself?
Answer: Eleven can do it trust me.