Dee ihe ọzọ maka paragraf a - N'oge agha Russia na Japan, Japan nwere ike ịwakpo ma weghara
n'ime izu ole na ole n'ọnwa Julaị afọ 1905. Site na nkwekọrịta nke Portsmouth, nke mechiri agha ahụ, Russia nyefere ọkara ndịda nke Sakhalin na Japan (nke etinyere dị ka Karafuto Prefecture), ebe ndị agha Japan kwụsịrị na ọkara ugwu ya; yabụ mba abụọ ahụ na nke mbụ na akụkọ ntolite ha kesara ókèala ala, nke na-aga n'akụkụ 50th dị n'ebe ugwu gafee agwaetiti Sakhalin dum, site na Strait nke Tartary ruo Oké Osimiri Okhotsk. Ọ bụ ezie na Japan weghaara akụkụ ugwu nke Sakhalin na 1920-1925, n'oge na mgbe Agha Obodo Russia gasịrị, Soviet na-achịkwa n'ebe ugwu Sakhalin guzobere na 1925, na 50th parallel ghọrọ ókèala Japan-USSR.