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The Japan–Russia border is the ''de facto'' maritime boundary that separates the territorial waters of the two countries. According to the Russia border agency, the border's length is 194.3 km.〔See the tables at (Сопредельные страны ) (Neighboring countries), at the Russia's border agency's (Rosgranitsa) official site〕 The two countries do not share a terrestrial border, although in 1905-1945 the Russian Empire, and, later, the USSR, did have a land border with Japan in Sakhalin Island. ==History== The border between Russia and Japan has changed several times over the last 200 years. The Treaty of Shimoda (1855) divided the Kuril Islands, creating a maritime boundary between the Japanese Etorofu (Iturup) in the south and the Russian Urup in the north. The treaty did not determine the status of Sakhalin. The Treaty of Saint Petersburg (1875) assigned Sakhalin Island to Russia and all of the Kurile Islands to Japan. Thus during the following 30 years the maritime border between the two empires ran along the La Pérouse Strait (between Hokkaido and Sakhalin) and the Kuril Strait (between Russian Kamchatka and Shumshu Island in the Kurils). During the Russo-Japanese War, Japan was able to invade and occupy the entire Sakhalin over several weeks in July 1905. By the Treaty of Portsmouth, which concluded the war, Russia ceded the southern half of Sakhalin to Japan, while Japanese troops withdrew from its northern half; thus the two countries the first time in their history shared a land border, which ran along the 50th parallel north across the entire island of Sakhalin, from the Strait of Tartary to the Sea of Okhotsk. Even though Japan occupied the northern part of Sakhalin in 1920-1925, during and after the Russian Civil War, Soviet control in the northern Sakhalin was established in 1925, and the 50th parallel became the Japan-USSR border. Since the Japanese Empire incorporated Korea by 1910, the short Korea–Russia border also became part of the border between the Japanese and Russian Empires, and later (until 1945), between the Japanese Empire and the USSR. The land border in Sakhalin was crossed by the Soviet Army in August 1945, while Soviet marines landed in the Kurils. As a result of the short Soviet–Japanese War (1945), the entire Sakhalin and the Kurils became ''de facto'' (and ''de jure'', under the Soviet law) part of the USSR, and of its constituent part, the RSFSR. Even though the USSR and Japan reestablished diplomatic relations a decade later (the Soviet–Japanese Joint Declaration of 1956), no peace treaty or maritime boundary agreement between the two countries have been signed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Japan–Russia border」の詳細全文を読む スポンサード リンク
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