Blockade
Блокада (original)
The longest siege during World War II was that of Leningrad, which lasted for 900 days. Comprised solely of rarely seen footage found in Soviet film archives, Blockade re-creates those momentous events through the sounds and the images of a slowly dying city.
Starring
Watch "Blockade" from streaming services Guidedoc, Amazon released in 2005. It's a documentary and history movie, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of movie.