Kim Jong Un, chairman of the Workers' Party of Korea (WPK) and chairman of the State Affairs Commission of the Democratic People's Republic of Korea (DPRK), visits an exhibition showcasing the innovation achievements of the Chinese Academy of Sciences since the 18th National Congress of the Communist Party of China (CPC). At the invitation of Xi Jinping, general secretary of the Central Committee of the CPC and Chinese president, Kim paid an unofficial visit to China from March 25 to 28. During the visit, Xi held talks with Kim at the Great Hall of the People in Beijing. (Xinhua/Yao Dawei)