Answer: There is a risk that military leaders will be proclaimed rulers.
Explanation:
Soldiers should first obey the state and then the general. Such situations can lead to a split in the state because generals can sometimes get out of control. That has been the case throughout the history of Roman protection. Namely, the Severus dynasty thus took power after the conflict with other Romans. Such a situation can lead to civil war. The founder of the Northern dynasty was the military leader Septimius.
Japan had few natural resources, including oil, so the country wanted to expand to get access to oil and other resources. As the map of China shows, China had oil and other natural resources.