Ryukyu islands, the southern half of Karafuto/Sakhalin islands, chishima/kuril islands, Taiwan, the Caroline islands etc..
Japan first expanded its empire after 1930 by invading Manchuria in 1931. This invasion was driven by a desire for resources and regional dominance, resulting in the establishment of a puppet state called Manchukuo. The expansion marked the beginning of a series of aggressive military actions in Asia.
;