• After the Russo-Japanese war, the Japanese formed a Kwantung Army in 1906 to protect the Liaodong Peninsula and Japan’s assets in Manchuria.
• Manchuria was rich in iron and coal
• Initially Manchuria warlord, Zhang zuolin, developed friendly relations with Japan and the Kwantung Army
• In 1928, Kwantung army assassinated Zhang in hope to replace him with more cooperative and capable leader
• Japan emperor criticised the army’s actions and demanded prime minister discipline them
• Prime minister unable to force military leaders to punish those responsible