it didn't do anything
When Italy invaded Ethiopia, the League of Nations, tried to penalize Italy by blocking trade to and from the country of Italy. This type of blockade is known as a trade embargo.
Japan had invaded china making the rest of Asia vulnerable.
japan
Japan
The League did absolutely nothing about it. They figured they should leave well enough alone because it had no effect on them, so why bother?
Germany invaded Poland and Japan invaded China.
no they did not but china did
League of Nations
They invaded the Chinese province of manchuria in 1931 That would have been the League of Nations, as UN didn't exist until 1945.
Disputes and crises in the contemporary world threaten international peace.
Japan decided to invade Manchuria the day after the Mukden incident, in 1931. However, the entire state of Manchuria was not conquered until 1932, so the answer to the question is 1932.