Sometime in the 70s (I think) I watched a film, whose English title was "The Dear Boy". I think it was a Russian film.
The film was about two boys, a Russian and an American, being kidnapped. I forget the details, but the striking thing about the plot is that the Russian boy is very passive, but the American boy is much more aggressive, and fights back, and eventually the two of them do escape, largely due to the American's efforts, I think. The only other thing I can remember about the movie is towards the end, when one of the kidnappers, a woman, chases the pair on a motorcycle. I think the two boys were in a car during the chase scene, and possibly one of them was driving, but I'm not sure about that. I've also got the feeling that the chase was along a winding ravine around a mountain-side and the woman comes to a sticky end, but I doubt this is useful identifying information, in any case.
I've only sporadically thought about this movie over the years, but I'd be very impressed if this site can locate it for me. The evidence suggests this is a very obscure movie, and doing searches for the title "The Dear Boy" produces nothing.
NOTE: I think "The Dear Boy" was the kidnappers' approving term for the Russian boy, because he didn't resist, but I'm not sure about that.