On 19 October 1965, Japan and the Soviet Union normalized their diplomatic relations after more than ten years of a state of war. Foreign Minister Shigemitsu Mamoru of the Hatoyama administration played a significant role in the process of the Soviet-Japanese normalization talks. This article attempts to discuss the main features of his negotiating policy, relying on the materials which have recently become available in Britain, the United States and Japan.
The main negotiating purpose consistently held by Shigemitsu was to conclude a peace treaty with the Soviet Union on the basis of solving the territorial problems. The prime minister insisted on early normalization by shelving such problems. Shigemitsu believed, however, that Hatoyama's formula would fail to solve them and would leave an intractable disturbing factor for future Soviet-Japanese relations. He regarded the restoration of the Habomais and Shikotan as the minimum territorial condition for concluding the peace treaty. In order to obtain Soviet concessions, he started with the hardest demand for the whole of the Kuriles, but he was prepared to retreat gradually from this to the minimum condition.
Both domestic and external circumstances were not favourable for Shigemitsu's purpose. The conservative merger between the Liberals and the Democrats did not allow him to make any rapid territorial concessions. The US State Department headed by John Foster Dulles had been implying its displeasure with possible Japanese territorial concessions to Russia. Moreover, the Russians insisted that Japan should recognize their sovereignty over the Kuriles and Sakhalin, though they offered to return the Habomais and Shikotan in August 1955. These circumstances made Shigemitsu adopt cautious and slow negotiations, and, therefore, he decided to demand as a bargaining card the southern Kuriles in response to the Soviet offer.
In the summer of 1956 in Moscow, Shigemitsu as the plenipotentiary decided to conclude the peace treaty by accepting the Soviet terms in order to prevent Hatoyama's ‘Adenauer formula’, though he knew his decision would be severely attacked by his colleagues in Tokyo. Consequently, Shigemitsu's effort was blocked and later Hatoyama succeeded in normalization by shelving the territorial questions. As Shigemitsu expected, the unsolved territorial questions became a ‘thorn’ of later relations between the two countries. Considering that, Shigemitsu's negotiating policy could have set an alternative course of postwar Soviet-Japanese relations, though many defects can be pointed out in his diplomacy.
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