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Second Sino-Japanese War

The Sino-Soviet Non-Aggression Pact

Saturday Aug 21, 1937
Nanjing, Jiangsu, China

In September 1937, the Soviet Union and China signed the Sino-Soviet Non-Aggression Pact and approved Operation Zet, the formation of a secret Soviet volunteer air force, in which Soviet technicians upgraded and ran some of China's transportation systems.


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