World War III
It was a miniseries with a miniseries cast--Rock Hudson, David Soul, Brian Keith--about a Soviet task force that slips into a US northern Alaska outpost, and a small team fights it off. It was literally a "cold war" in miniature.
An enjoyably grim movie, it has one really gruesome real life footnote. The director, a real loudmouth, was getting out of a helicopter and yelled at someone, and turned and walked away in a huff...right into the rotor on the back of the helicopter, and was decapitated!
Personally, I thought WWIII was just a bit goofy, however, David Soul was in "The Disappearance of Flight 412" as well. :-)
Both "Threads" and "The Day After" were definitely war scare movies! I have both in my library.