Jack had picked up Dimitri, as the CIA told him. He needed to get exfiltrated as soon as possible, the message was, because his cover had blown. Therefore, Jack and him had to leave country by the least suspicious method known to man, a hovercraft across the tundra, towards the icy polar sea where a submarine would await them.
Dimitri pulled out his vodka, offering some to Jack who politely refused, he probably should remain sober on a journey this dangerous. Dimitri shrugged and downed it all. He probably was done for the day.
Jack was very surprised to find Dimitri keep his cover even when drunk, chanting “death to the capitalists” and like a good commie would do. He asked Dimitri if he maybe could stop that, now that the submarine was in sight, what would the commanders think, when Dimitri slurred something about a being a double-triple-quadruple agent. And indeed, shortly before they reached the submarine, a missile from an Ekranoplan destroyed it, shortly followed by a space laser destroying the Ekranoplan, shortly followed by Hitler in a UFO destroying the space laser.
The Nazis had won after all, Jack thought just before he froze to death.