 Zhou increased and improved CCP intelligence efforts within the KMT, Wang Jingwei's Nanjing government, and the Empire of Japan, recruiting, training, and organizing a large network of Communist spies.Yan Baohang, a secret Party member active in Chongqing diplomatic circles, informed Zhou that Hitler was planning to attack the Soviet Union on 22 June 1941.Under Zhou's signature, this information reached Stalin on 20 June, two days before Hitler attacked.