Answer: Empire of Japan
Step-by-step explanation:
Japan had been looking for a way to gain more territory in China and staged an incident in Mukden which they followed up by invading Manchuria so as to have access to its raw materials.
China appealed to the League of Nations of which both they and Japan were part of and after the Japanese vetoed an order for them to withdraw, the League established a Commission to solve the crises.
The Commission recommended that Manchuria stay under China and this enraged the Japanese who promptly withdrew from the League in March 1933.