A film about Stanislov Petrov, a hero from the Soviet Union who saved the world with a decision he made one night in 1983.
Here is a link to the official homepage. Here is a trailer narrated by Kevin Costner.
In the trailer he says he never wanted to go into the military. He says his parents pushed him into it.
An article about the documentary in Commonweal. Here is an article about Petrov in The Atlantic.
I hope it is coming soon to a theater near me!