Huge Chinese Drone Swarms Could Block Out the Sun China has a history of overwhelming its enemies with sheer numbers of troops. Here's What You Need To Remember: What’s particularly interesting about a Chinese drone swarm is China’s predominance in drone production. Chinese manufacturer DJI makes nearly 80 percent of the drones used in the United States and Canada (U.S. authorities recently warned these robots could be stealing data from their users). China has a history of overwhelming its enemies with sheer numbers of troops. Now, China may have a modern iteration on that tactic: swarms of tiny rocket-armed helicopter drones that will swamp enemy forces like angry bees.