Wang Zhiqiang, curator of the Museum of the Imperial Palace of "Machukuo", introduces an audio record of confession from Imperial Japanese Army (IJA) war criminals during the 1949 Khabarovsk War Crimes Trials the museum has newly acquired in Changchun, northeast China's Jilin Province, May 7, 2018. The 22-hour-long audio record, provided by a Russian state-level audio archive, reveals the germ warfare atrocities of IJA's clandestine Unit 731 and Unit 100 in China. (Xinhua/Lin Hong)