File photo shows a J-10C fighter jet flies through a valley during a flight training exercise. The lightweight, semi-stealth, single-engine, multi-role fighter jets J-10C of the Chinese PLA Air Force have been put into real combat roles, which marks an improvement in the combat and defense capabilities of the Chinese Air Force, according a statement of the Air Force on April 16, 2018. (english.chinamil.com.cn/ Photo by Xi Bobo)
