Cika wannan jumlar: Japan
Sakhalin ya mamaye Sakhalin a ƙarshen yakin Russo-Japan na 1904-1905, amma bisa ga Yarjejeniyar Portsmouth ta 1905 an ba shi izinin riƙe kawai kudancin tsibirin da ke ƙasa da 50 ° N layi. Rasha ta ci gaba da arewacin yankin, kodayake Jafananci sun sami 'yancin kasuwanci masu kyau, gami da haƙƙin kamun kifi da haƙƙin hakar ma'adinai a arewa. A cikin 1907, an kafa Karamar Hukumar Karafuto a hukumance, tare da babban birnin a Ōtomari. A shekara ta 1908, an koma babban birnin zuwa Toyohara.