A J-20 stealth fighter jet attached to the Chinese People's Liberation Army Eastern Theater Command takes part in exercises. The aircraft is not equipped with a Luneburg lens, a radar reflector used to make a stealth aircraft visible to others in training or non-combat flights. Photo: Screenshot from China Central Television

A J-20 stealth fighter jet attached to the Chinese People’s Liberation Army Eastern Theater Command takes part in exercises. The aircraft is not equipped with a Luneburg lens, a radar reflector used to make a stealth aircraft visible to others in training or non-combat flights. Photo: Screenshot from China Central Television