This is a really fine movie, with some marvelous subtlety and powerful metaphor, despite the fact it shows its age. Great editing, good script, some superb scenes. I can't understand why it is not more widely known and appreciated. The Cold War is simply the setting; the unprepossessing story means far more.
For those who might be interested, this was the favorite movie of American poet Richard Hugo (1923-1982), who wrote several pages about it in his posthumously published 1986 autobiography, The Real West Marginal Way. A couple of Hugo's comments:
"The border becomes a kind of symbolic line separating the will from the imagination, the world of serious organizational adult responsibility from the paradise of childhood play."
"More than anything else, the music {of the amateurish circus musicians} attests to the poor odds facing not only the tacky circus but humanity itself."