They left in 1939 after they invaded Finland. They did not leave themselves, they were ordered to leave
Russia joined the league of nations in 1934
Germany and Russia
The United States, Germany, and Russia were three major powers that were not members of the League of Nations. The League of Nations lasted from 1919 to 1946.
The league of nations failed because Germany and Russia two of the great powers in the world did not join the league of nations until later on and even then Germany left. America also didn't join the league of nations because the civillians didn't want to join.
Because, unlike the United Nations, it never had even close to total membership of the countries of the world. Strong nations like America and Russia not joining meant the League could not enforce its decisions. When Russia eventually joined, it then left - as did Germany. Showing that if a nation disagreed with the League, it was easy to leave, and be outside their jurisdiction. The same happened with Japan, which was even a permanent member of its Security Council, with withdrew when it was criticised for invading Manchuria.
They were a communist country and hated Britain & France.
The league of nations failed because Germany and Russia two of the great powers in the world did not join the league of nations until later on and even then Germany left. America also didn't join the league of nations because the civillians didn't want to join.
Germany withdrew from the league in 1933 on the grounds that the League did not treat them fairly.
At the time the League of Nations was trying to pursue a policy of multi--lateral reductions in armaments - the very opposite of what Hitler wanted.
League of Nations
Germany withdrew from the League of Nations on the 19th of September, 1933.
The League of Nations.