During the first half of the 20th century, the Empire of Japan fought a series of undeclared wars in the Far East against Tsarist Russia and the successor Soviet Union. The first of these, fought in 1904-1905 over rival imperial ambitions in Manchuria and Korea, ended in a clear-cut Japanese victory.
Following the Japanese occupation of Manchuria, in 1931, Japan turned its interest to nearby Soviet territories. The result was a series of border...
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