The Fall of Chiang Kai-Shek

By October, the combined forces of the Sichuan Clique and Japanese forces had managed to shatter the Kuomintang Army and capture Chiang Kai-Shek. Wang Jingwei offered positions in the Provisional Government to the Sichuan Clique comparable to those they had had under Chiang with added benefits which they were quick to accept.
Chiang was tried and found guilty of treason to the Chinese state. He would be executed November 27, 1943.

With the Provisional Government now in full control of the country, Wang Jingwei signed a treaty with Japan recognizing Manchukuo, Menjiang, the Xinjiang Republic, and numerous trade policies which favored the Japanese Empire. It also allowed for Japanese occupation at key points throughout China and limited China's military size and composition.

The communists under Mao would struggle on though without military aid they found their support faltering. The Japanese and Provisional forces destroyed every village suspected of helping the communists, killing hundreds of thousands and eroding all support for the guerillas until Mao would be captured in 1945, given up by a traitor in his own ranks.

SOURCE: Liu Bao The Fall of the Kuomintang