User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-67.169.165.224-20130803194053/@comment-67.87.55.100-20130804053850

In 1917, Russia wasn't controlled by the Bolshevicks yet, they didn't seize power until 1920, so the Soviet Union doesn't even exist yet