Shigetada Nishijima

Nishijima (back row, third from right) during Sukarno's visit to Makassar in 1945.

After the Japanese invasion of the Dutch East Indies, Nishijima was repatriated in 1942 (alongside 834 other internees in a prisoner exchange) and was sent to Java. Dutch security forces failed to identify Nishijima as a naval spy, as he was listed as a businessman in the Dutch intelligence documents.[4]

Nishijima then worked with the Japanese Navy Liaison Office in Jakarta, where he reestablished his contacts with Indonesian nationalists such as Achmad Soebardjo, who had worked with the office in New Guinea relating to maps and topics.[5] Following Kuniaki Koiso's promise of Indonesian independence in 1944, Maeda sponsored the school Asrama Indonesia Merdeka (a school intended to train future Indonesian leaders), with Nishijima and his fellow Japanese agent Tomegorō Yoshizumi acting as Maeda's assistants.[6]

After the surrender of Japan, Nishijima was sent to locate Sukarno and Mohammad Hatta (who were missing from Jakarta, as they were kidnapped by nationalist youths and held in Rengasdengklok). He managed to convince Wikana to return both leaders to Jakarta.[7] He was then assigned to help Indonesian nationalists Sukarni and Sayuti Melik ensure the more radical pemuda did not cause issues during the negotiations between the nationalist leaders and the Japanese occupation force, primarily to stop interference from Japanese guards.[8]

He then participated in a meeting at Maeda's house when the Indonesian Proclamation of Independence was drafted, and with his help copies of the text were printed by the Naval Office' press.[9] He was arrested as a war criminal by December 1946, but was released and returned to Japan.[5][10]

After a rejection of his visa in 1951 due to "official sensitivity",[11] Nishijima returned to Indonesia in March 1953 in order to meet Sukarno to discuss war reparations. Discovering Japan's poor image in Indonesian media, he mediated for Aiichirō Fujiyama to sponsor and invite Indonesian journalists to visit Tokyo – which included Rosihan Anwar, Mochtar Lubis and Adam Malik. Nishijima built relations with Adam Malik in particular, and in a 2005 interview former CIA agent Clyde McAvoy noted that Nishijima was a vital intermediary between him and Malik (which involved funding anti-communist groups following the 30 September Movement).[12]

In 1958, Nishijima met Pertamina chief Ibnu Sutowo, and through negotiations helped establish relations between the oil company and the Japanese "Kobayashi Group" (coordinated by industrialist Ataru Kobayashi), which eventually culminated in the formation of Nosodeco to exploit oilfields in North Sumatra.[13] Nishijima, alongside Maeda, were also involved in negotiating oil contracts in West Papua following the conclusion of the West New Guinea dispute.[5]

Nishijima later became a leader and pioneer at the Indonesian Study Group of Waseda University, which published works related to the Japanese military administration of Indonesia.[14] Though the research topic was largely neglected during the 1960s and early 1970s, Japanese scholars who were part of the research group was given more attention by the late 1970s and 1980s.[15] The Indonesia ni okeru Nippon Gunsei no Kenkyu (Study of Japanese Military Administration in Indonesia) was published in 1959, and his works and memoirs was donated to Waseda in 1971, compiled, and published in 1973 as "The Nishijima Collection".[16] He gave an interview for the Kompas newspaper in October 2000, as likely the last living witness of the formulation of the proclamation text.[17] He died at the age of 95, on 9 December 2006.[18]