The Man Who Saved the World
Starring Stanislav Petrov, Kevin Costner, Matt Damon, Robert De Niro, Sergey Shnyryov, Nataliya Vdovina, Walter Cronkite, Oleg Kassin, Ashton Kutcher, Vilis Daudziņš
It's a documentary and history movie, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.