Photo taken on June 4, 2018 shows the night view of Zhanqiao Pier in Qingdao, East China's Shandong province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]

Photo taken on June 4, 2018 shows the night view of Wusi Square in Qingdao, East China's Shandong province. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]

People watch a light show in Qingdao, East China's Shandong province, June 4, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]