This is a magnificent, and in many ways impressive film. I saw it on TV as a little boy, with my throat almost strangled with tears, and again today on the magnificently restored Criterion DVD.
Cranes is the very essence of the War Weepie. Imagine Umbrellas of Cherbourg with no music and no color, or Waterloo Bridge with no class consciousness.
Tatiana Samoilova, a cross between Vivien Leigh and Bjork, is deeply affecting as a pretty girl whose fiancé enlists and doesn't write or come back.
The fiancé, Boris, dies on the front, and his death scene is indescribably romantic. Very daring too, because so close to "over the top." But that scene will stay with you.
Although the Soviets were so defined by WWII, the movie is quite unspecific, and more powerful for it. The pre-war and post-war scenes have a very 1957 feel. There is no attempt at period detail. The whole film becomes more and more stylized, until the Siberian scenes, which feel like a modern opera set (that is a compliment). The cathartic final scene is milked to its last drop - there again, comparable to Cherbourg. The production feels like a big budget (those staircase scenes must have cost a pretty kopek).
Go for it. Don't expect a bitter socialist pill (although it is, of course, very sad). The Cranes are Flying is an impressive slice of world cinema, quite advanced considering where and when it was made.