Why didn't Japan annex Siberia during the Russian Civil War? (Short Animated Documentary)

 

When Russia was divided in the wake of its 1917 revolution, the Entente powers intervened and occupied parts of the country. In Siberia, Japan sent a very large force and took control over a large chunk of it. But it didn't hang around and fully withdrew after a few short years. So why did it leave…

Source: History Matters (2023-03-19)