After negotiations with China, a new civil war broke out in the country between communist and democratic factions. Japan, compromised by the secret treaty with Germany, decided to intervene in the conflict.
Japan provided weapons, ammunition and logistical support to the Democratic forces, who were fighting the Communists led by Mao Zedong. Additionally, Japan sent troops to train Democratic forces and assist in the fight against the Communists.
For its part, Germany also intervened in the conflict, sending weapons and troops to support the democratic forces. German aid was crucial in strengthening the Democrats' position and weakening communist resistance.
Faced with growing foreign intervention in the Chinese civil war, the Soviet Union decided to support the communists. Stalin sent troops and ammunition to help Mao Zedong in his fight against the Democrats and their foreign allies.
Rising tensions between Japan and the Soviet Union became evident when the Soviet Union deployed troops to the border with Manchukuo, prompting a response from Japan that also sent soldiers to the area. This escalation increased tensions between Japan and the Soviet Union, intensifying the conflict in the Far East.
The intervention of Germany and the Soviet Union in the Chinese civil war transformed the conflict into an international confrontation with serious consequences for the region and the world.