Sakhalin Oblast
Ethnic groups: 409,786 ethnic Russians are the largest group, followed by 24,993 Koreans (see Sakhalin Koreans), 12,136 Ukrainians and many smaller ethnic groups, including 219 Japanese and Ainu (0.05%), who were native to the region and opposed the Soviet Union taking the territory after World War II. The ethnic groups of the oblast in 2010 were: