At a military parade in Beijing in September, President Xi Jinping and his special guests, President Vladimir V. Putin of Russia and the North Korean leader, Kim Jong-un, watched as Chinese forces showed off several models of drones that could autonomously fly alongside fighter jets into battle. The demonstration of technological might immediately set off alarm bells in the United States. Pentagon officials concluded that America’s program for unmanned combat drones was lagging China’s, according to three U.S. defense and intelligence officials. Russia, too, was thought to be ahead in building facilities that could produce advanced drones, said the officials, who were not authorized to speak publicly on military capabilities.

Full commentary : China, the U.S., Russia and others have ramped up their contest over artificial-intelligence-backed weapons and military systems.