After the Russo-Japanese War, Russia and Japan signed the Treaty of Portsmouth of 1905, which saw the southern part of the island below 50th parallel north reverting to Japan ; Russia retained the other three-fifths of the area.

After the Russo-Japanese War, Russia and Japan signed the Treaty of Portsmouth of 1905, which resulted in the southern part of the island below 50 ° N passing to Japan ; the Russians retained the other three-fifths of the area.

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