A famous Russian joke, also riffing on the large numbers and supposed incredible obedience of the Chinese:
The Chinese Government asked for help in curbing population growth. The Europeans, Americans and Japanese all offered the latest developments in birth control, but they were all too slow and expensive. The Russians offered to do it for free and in an instant, and won the contract. They sent a number of Russian Army officers, who gathered up a line of 100 million Chinese males.
Officers: "Ten-hut! Put down your pants!"
Without hesitation, the men drop trou.
Officers: Turn to your right!"
The Chinese do in perfect unison. One junior officer mutters, "Wish I could get just 10 Russian rookies to do a right-face like that..."
Officers: "Bend down and take your neighbour's balls in your mouth!"
Again, they obey without hesitation. Then a soldier came to one end of the line, and kicked the first Chinese in the balls. The sound of "Chomp, chomp, chomp..." receded in the distance...