China has received a batch of Russian-provided evidence related to the infamous Unit 731, a Japanese germ-warfare unit that operated during World War II, China's Central Archives announced on Saturday. A CGTN reporter spoke with Zhou Zhenfan, deputy director of the Preservation Department of the Central Archives, about how these documents reveal the unit's blatant violations of international conventions and provide irrefutable historical evidence of Japan's use of biological warfare during its invasion of China.