system
Given the following post, respond as if you're commenting on Reddit:
human
[Stranger Things 3]Why didn't This start world War three?

Dustin saying this is a "red Dawn scenario" was  played for humor but it really kind of is. 
A whole Russian military instillation on (or under) US soil at the height of the cold war.
gpt
Here's a secret about World War III in the 80's: 

NOBODY wanted World War III. It was a guaranteed lose situation for both sides. So both governments would do a lot to prevent it. They'd argue, yell at each other, maybe make concessions, possibly start a smaller proxy war somewhere else under flimsy pretenses, but both parties would still be really motivated to find some sort of peaceful compromise.

Remember, it wasn't an "invasion" where lots of people got killed. It was spying, which both sides did, so no lines were really crossed and the cold war could still plausibly stay cold for a little while longer.