I hate to put on my nerd goggles here, but technically that isn't a Soviet flag because it lacks the red star outlined in yellow above the hammer and sickle. Seems to be a flag specifically of the Communist Party of China, not the nation. There are other political groups in Asia still use the hammer and sickle as well: White H&S centered on red is the Communist Party of Kerala in India and a yellow H&S centered on red is the flag of the New People's Army in the Philippines, there are probably more out there I'm not aware of, I'm no expert on these matters.