news China deploys J-20 stealth fighter jets to units monitoring Taiwan Strait China has begun mass-producing the upgraded version of the J-20. Photo: 81.com China has deployed its most advanced stealth fighter jet to air force units monitoring the Taiwan Strait and the East China Sea, state media said, in a move Chinese observers saw as a warning to South Korea and Japan, the US' allies in the region. The deployment indicated China had delivered at least four aviation brigades with a total of 150 J-20 fighter jets, including two training bases in Inner Mongolia and Hebei and two aviation brigades in the eastern and northern theatre commands, a military insider said.