![This file photo taken on October 14, 2018 shows an F-35 fighter aircraft of the Japan Air Self-Defense Force taking part in a military review at the Ground Self-Defence Force\'s Asaka training ground in Asaka, Saitama prefecture. A Japanese F-35 stealth fighter jet with one pilot on board disappeared from radar while on a training mission over the Pacific on April 9, 2019 night, the defence ministry said. (Photo/VCG)](http://www.ecns.cn/hd/2019/04/10/d65feb8100504cb99fb2ad9bd585f8f8.jpg)
This file photo taken on October 14, 2018 shows an F-35 fighter aircraft of the Japan Air Self-Defense Force taking part in a military review at the Ground Self-Defence Force's Asaka training ground in Asaka, Saitama prefecture. A Japanese F-35 stealth fighter jet with one pilot on board disappeared from radar while on a training mission over the Pacific on April 9, 2019 night, the defence ministry said. (Photo/VCG)
![File photo taken in January 2018 shows an F-35 fighter jet at the Japanese Air Self-Defense Force\'s Misawa Air Base in Aomori Prefecture. (Photo/VCG)](http://www.ecns.cn/hd/2019/04/10/50fec552fe1c4e6db3ab81bd5485b6b4.jpg)
File photo taken in January 2018 shows an F-35 fighter jet at the Japanese Air Self-Defense Force's Misawa Air Base in Aomori Prefecture. (Photo/VCG)