Chinese peacekeeper Yu Peijie (R) sings songs with local children in Juba, South Sudan, on April 30, 2018. Yu Peijie, 26-year-old, is the leader of the female peacekeeper unit of Chinese peacekeeping infantry batallion to South Sudan. (Xinhua/Wang Teng)

Chinese peacekeeper Yu Peijie (3rd L) dances with fellow soldiers in a gym at the camp of Chinese peacekeeping infantry batallion to South Sudan on April 30, 2018. Yu Peijie, 26-year-old, is the monitor of the female peacekeeper team of Chinese peacekeeping infantry batallion to South Sudan. (Xinhua/Wang Teng)

Local children present a tool rifle to Chinese peacekeeper Yu Peijie (C) as a gift at No.1 refugee camp of the United Nations, South Sudan, on April 30, 2018. (Xinhua/Wang Teng)

The photo taken on Nov. 8, 2017 shows Chinese peacekeepers working at a minefield near the UN demarcated "Blue Line" in southern Lebanon. The UN Security Council established the United Nations Interim Force in Lebanon (UNIFIL) on March 19, 1978 to monitor the withdrawal of Israeli forces from southern Lebanon. (Xinhua/Dong Yongkang)

The photo taken on Nov. 8, 2017 shows Chinese peacekeepers working at a minefield near the UN demarcated "Blue Line" in southern Lebanon. The UN Security Council established the United Nations Interim Force in Lebanon (UNIFIL) on March 19, 1978 to monitor the withdrawal of Israeli forces from southern Lebanon. (Xinhua/Dong Yongkang)

The photo taken on Dec. 15, 2017 shows Maj. Gen. Michael Beary, head of Mission and Force Commander of the United Nations Interim Force in Lebanon, taking photos of a removed mine at a minefield near the UN demarcated "Blue Line" in southern Lebanon. The UN Security Council established the United Nations Interim Force in Lebanon (UNIFIL) on March 19, 1978 to monitor the withdrawal of Israeli forces from southern Lebanon.(Xinhua/Dong Yongkang)

Blue Tone band of Chinese peacekeepers perform during their farewell concert at the Chinese camp of the UN Multidimensional Integrated Stabilization Mission in Mali, May 12, 2018. In late 2013, China, for the first time, dispatched a security force of 170 soldiers to the UN Multidimensional Integrated Stabilization Mission in Mali (MINUSMA). (Xinhua/Han Lijian)

Chinese peacekeepers pratise for their Blue Tone band at the Chinese camp of the UN Multidimensional Integrated Stabilization Mission in Mali, May 12, 2018. In late 2013, China, for the first time, dispatched a security force of 170 soldiers to the UN Multidimensional Integrated Stabilization Mission in Mali (MINUSMA). (Xinhua/Han Lijian)

Chinese peacekeepers pratise for their Blue Tone band at the Chinese camp of the UN Multidimensional Integrated Stabilization Mission in Mali, May 12, 2018. In late 2013, China, for the first time, dispatched a security force of 170 soldiers to the UN Multidimensional Integrated Stabilization Mission in Mali (MINUSMA). (Xinhua/Han Lijian)