always get a kick out of "purple sunset" 2001 - ww2 movie about soviet invasion of manchuria with japs being rolled over by tanks.
http://www.movies.com/purple-sunset/m24534
from wikipedia about the invasion of manchuria by soviet and mongolian forces.....
"Tsuyoshi Hasegawa's research has led him to conclude that the atomic bombings were not the principal reason for Japan's capitulation. He argues that Japan's leaders were impacted more by the swift and devastating Soviet victories on the mainland in the week following Joseph Stalin's August 8 declaration of war because the Japanese strategy to protect the home islands was designed to fend off a US invasion from the South, and left virtually no spare troops to counter a Soviet threat from the North. This, according to Hasegawa, amounted to a "strategic bankruptcy" for the Japanese and forced their message of surrender on August 15, 1945.[23][24] Others with similar views include The "Battlefield" series documentary,[2] Drea,[19] Hayashi,[20] and numerous others, though all, including Hasegawa, state that the surrender was not due to any single factor or single event."