Border Zone

Border Zone (1987), a real-time spy adventure in three parts by Marc Blank.

As described on the box:

The story begins on the train to Litzenburg, a peaceful country just outside the Iron Curtain. In the border town of Ostnitz, Constitution day festivities include a speech by the American ambassador. But plans are afoot to destabilize this key neutral territory by assassinating the diplomat. Speeding towards the border through the Eastern bloc country of Frobnia are an easy-going American businessman, an ambitious American spy and a ruthless KGB agent. All three are soon to become entangled in the assassination plot, their lives intertwining as each carries out his perilous assignment.

You'll see the story from three viewpoints, as you step into the shoes of a different major character in each of the three chapters of Border Zone. Set in separate locations on or near the border, the chapters are complete stories in themselves, each with its own riveting conclusion.