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

He Feng, vice president of Beijing Viga UAV Technology Corp Ltd, exchanges name cards with a potential customer, in front of 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]