Nuclear explosion will nearly kill humanity

Konstantin Lopushansky, Vyacheslav Rybakov with participation of Boris Strugatsky : Author, film director, film theorist
The plot is set in a town after a nuclear war, which was caused by a computer error and the failure of the operator to prevent the missile launch — he noticed the mistake, but choked on coffee and was not able to shout respective commands in time. The town is destroyed and polluted with radioactive elements.
The Chernobyl disaster happened in the same year

movie "Dead Man's Letters"