
Children play roller-skating during an International Children's Day celebration held in Pyongyang, capital of the Democratic People's Republic of Korea, June 1, 2017. (Xinhua/Zhu Longchuan)

Children play roller-skating during an International Children's Day celebration held in Pyongyang, capital of the Democratic People's Republic of Korea, June 1, 2017. (Xinhua/Zhu Longchuan)