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A decades-long territorial dispute has prevented Japan and Russia from signing a formal treaty to end WWII. Photo: AFP

Soviet Union sought to end island row in 1972 amid Japan-China thaw: declassified documents

  • The Soviet Union’s move was prompted by wariness over the normalisation of diplomatic ties between China and Japan
  • However, Japan and Moscow did not come to a compromise due to Tokyo’s insistence on the return of all four islands
Japan

The Soviet Union in 1972 sought to settle a territorial dispute with Japan by handing over two of four disputed islands off Hokkaido, in response to improving China-Japan ties, declassified documents obtained by Kyodo News showed on Sunday.

It is the first time it has come to light that the Soviet Union’s wariness about the normalisation of diplomatic ties between China and Japan prompted Moscow to seek resolution of the territorial dispute with Tokyo and thus the conclusion of a post-war peace treaty, according to experts in Japan and Russia.

A series of formerly classified documents, including a draft peace treaty, were drawn up when the Political Bureau of the Central Committee of the Communist Party of the Soviet Union discussed measures to improve relations with Japan on August 3, 1972.

The disputed islands are called the Northern Territories in Japan and the Southern Kurils in Russia. Photo: AFP

However, Japan and the Soviet Union did not come to a compromise due to Tokyo’s insistence on the return of all four islands.

The draft peace treaty was not presented during a visit by then Prime Minister Kakuei Tanaka to Moscow in October 1973, either.

The decades-long row over the islands, called the Northern Territories in Japan and the Southern Kurils in Russia, has prevented the two countries from signing a post-World War II peace treaty.

The islands at the centre of a territorial dispute between Russia and Japan

The 1956 Japan-Soviet Joint Declaration, which Russian President Vladimir Putin has repeatedly affirmed remains valid, says Russia will hand over Shikotan and the Habomai islet group after concluding a peace treaty with Japan.

According to the documents, the Soviet Foreign Ministry, the KGB state security agency and the Defence Ministry warned of China’s intention to complicate any improvement of relations between Japan and the Soviet Union as Beijing rushed to normalise diplomatic ties with Tokyo.

The Politburo, seeing the signing of a peace treaty with Japan as one of the top priorities of its diplomatic agenda, adopted a negotiation strategy on the basis of a return of the two smaller islets.

The Politburo, however, agreed it would reject a Japanese demand for the return of two larger islands of Kunashiri and Etorofu.

The documents showed the Soviet Union clearly recognised the need to demarcate a border with Japan through a peace treaty.

A peace treaty with Japan? No rush, says Russia

Staying vigilant of the Japan-US alliance, the Soviets demanded a guarantee from Japan and US forces stationed in the country that they will not attack in return for handing over Shikotan and the Habomais.

Moscow also attached importance to winning economic cooperation from Tokyo.

The draft peace treaty prohibited both parties from intimidation by actual use of force, as well as letting others use their territories for acts that would cause military damage to either.

The draft demanded that Japan permanently demilitarise the two islands once returned, and that the two sides make no more claims on each other’s territories in the future.

The Politburo, however, hardened its stance two months before Tanaka’s 1973 trip to Moscow.

In a meeting on August 16 that year, the Politburo discussed plans for Tanaka’s visit and the Foreign Ministry reported that Japan’s stance on the return of the four islands had not changed.

During Tanaka’s visit, the Soviet Union did not present the two-island settlement plan, nor even acknowledge the existence of the territorial dispute.

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