A gardener works on a street in Qingdao, East China's Shandong province, June 3, 2018. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao. [Photo/Xinhua]

A staff member decorates a sign of Shanghai Cooperation Organization (SCO) Summit in Qingdao, June 2, 2018. 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 red lanterns 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]