This undated photo shows a staff member from China's Central Archives arranging some Russian-provided archive copies related to the infamous Unit 731, a Japanese germ-warfare unit that operated during World War II. China has received a batch of Russian-provided evidence related to the infamous Unit 731, China's Central Archives said on Saturday. The archive copies from Russia include trial records of Unit 731 members, investigation reports on the unit's crimes, and internal official correspondence of Soviet authorities, covering the period running from May 11, 1939 to Dec. 25, 1950. (Xinhua/Li Xin)