China-developed drones at Silk Road expo in Xi'an

He Feng, vice president of the Beijing Viga UAV Technology Corp Ltd, shows an unmanned aerial vehicle at the 2017 Silk Road International Exposition and the 21st Investment and Trade Forum for Cooperation between East and West China in Xi'an, Northwest China's Shaanxi province, on June 3. [Photo by Yang Yang/chinadaily.com.cn]