The close relations existing between Beijing and Moscow from 1949-58 represent an exceptional interlude in the much longer historical pattern of mutual suspicion and hostility between China and Russia. China and Russia had border disputes since the seventeenth century when Tsarist forces occupied Nerchinsk and Yakasa in the Amur region (north of Mongolia and west of northern Nei Mongol). The eighteenth century saw Russian incursions in the Lake Balkhash area, near Northwest Xinjiang. By the beginning of the nineteenth century, the Russians had seized a total 1.4 million square kilometers, and another 1.5 million by 1900. The Russians codified these gains through a series of 'unequal treaties,' as current Chinese histories call them.
The Beijing government began to challenge Soviet occupation of these disputed areas in 1963, and, with China's demonstration of its nuclear capability in 1964, the military build-up on both sides of the border began in earnest. In Japanese press, Mao was quoted as saying that both Vladivostok and Khabarovsk were on territory that had belonged to China save for 'unequal treaties.'
Soviet ground forces had been augmented in the last half of 1967 in regions bordering China in the Far East and Transbaykal Military Districts. From 1965 to the end of 1969, the USSR increased its deployment of ground forces in the military districts adjacent to the Chinese border from 13 divisions to 21 divisions.
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