Well...more hypothetically, Austria isn't in NATO and in 1985 it bordered three Warsaw Pact countries. Here we suppose a little panic with large Soviet forces in Hungary that triggers a French move to deter any more trouble which triggers the attack on Austria it was supposed to deter.
The game is The Doomsday Project Episode 2 about an imaginary WWIII.
Here's some footage of the first stages of the conflict in Austria: