Undated file photo shows China's J-20 stealth fighter jet takes off for a night confrontation training mission during a coordinated tactical training exercise with J-16 fighter jets and J-10c fighter jets in an effort to boost the PLA Air Force's combat capability.
A J-11B fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through a valley during a flight training exercise in early May, 2018.
An amphibious assault breacher vehicle attached to a brigade under the PLA Navy's Marine Corps fires at mock targets during a recent live-fire training exercise.
Marines in amphibious assault vehicles fire smoke grenades at a training range in southwest China's Yunnan Province during an assault training mission in late May, 2018. They are assigned to a brigade under the PLA Navy's Marine Corps.
The construction of the PLA Djibouti Logistic Support Base is to better implement our international responsibility and obligations of escort and humanitarian assistance in the Gulf of Aden and waters off Somalia.
Infantrymen assigned to a brigade under the PLA 74th Group Army advance to assault mock enemies after disembarking from an armored vehicle during a breach and assault training exercise in southern China's Guangdong Province on May 29, 2018.
Two fighter jets attached to an aviation brigade of the air force under the PLA Southern Theater Command soar over the sky for a combat sortie during a flight training exercise in late May, 2018.
Soldiers assigned to a brigade under the PLA 75th Group Army deploy a vehicle-mounted REBS during a bridge-building training exercise on May 28, 2018.
Two fighter jets take off for a combat sortie during the "Red Sword-2018" systemic confrontation training exercise held by the Chinese PLA Air Force in northwestern China's deep desert on May 25, 2018.
A J-11 fighter jet attached to an aviation brigade of the air force under the PLA Eastern Theater Command prepares to take off for a night flight training mission on May 25, 2018.
Taikonauts Nie Haisheng (L) and Liu Wang exit from a re-entry capsule during a wilderness survival training in the Badain Jaran Desert in northwest China's Gansu Province, May 17, 2018.
A Chinese-made military drone is displayed at the Kazakhstan Defense Exhibition in Astana, capital of Kazakhstan, May 23, 2018.
A Y-8 reconnaissance aircraft taxies on the runway in preparation for takeoff during a flight training exercise in northeastern China's Liaodong Peninsula on May 21, 2018.
Tanks are en route to a designated training area at the foot of the Tianshan Mountains during a long-distance round-the-clock maneuver in northwestern China's Xinjiang Uyghur Autonomous Region in late May, 2018.
Special operations soldiers wearing Ghillie suits aim their rifles and conduct tactical movement during a reconnaissance and assault operation in a jungle area in mid-May, 2018.
Special operations soldiers carrying full rucksacks engage in a long-distance march during a recent round-the-clock comprehensive training exercise.
A J-11 fighter jet attached to an aviation brigade of the air force under the PLA Eastern Theater Command prepares to taxi out for a night flight training exercise on May 17, 2018.
Special operations soldiers advance to assault mock enemies after fast-roping from a transport helicopter during a round-the-clock training mission near the Tianshan Mountains of northwest China’s Xinjiang Uygur Autonomous Region in late April, 2018.
An HQ-12 anti-aircraft missile is fired at a mock aerial target during a live-fire training exercise in northwestern China's Gobi Desert in mid-May, 2018.
China's second aircraft carrier returns to dock at the Dalian Shipyard in northeastern China's Liaoning Province on May 18 after its first sea trials. The aircraft carrier was launched in April last year and began the sea trials on May 13, 2018.