Japan consistently encouraged a negotiated settlement at the earliest possible date. Even before the hostilities ended, it had made contact with the Democratic Republic of Vietnam (North Vietnam) government and had reached an agreement to establish diplomatic relations in September 1973. On 21 September 1973, Japan and the Democratic Republic of Vietnam (North Vietnam) signed the "Exchange of Notes Concerning the Establishment of Diplomatic Relations Between Japan and the Democratic Republic of Vietnam" in Paris, this document was in the French language and restored the diplomatic relations between Japan and North Vietnam. On the Japanese side the document was signed by Yoshihiro Nakayama, the Japanese Ambassador to France, while for the North Vietnamese side the document was signed by the Charge d'Affaires ad interim of North Vietnam to France Võ Văn Sung. Implementation, however, was delayed by North Vietnamese demands that Japan pay the equivalent of US$45 million in World War II reparations in two yearly installments, in the form of "economic cooperation" grants. Giving in to the Vietnamese demands, Japan paid the money and opened an embassy in Hanoi on 11 October 1975, following the unification of North Vietnam and South Vietnam into the Socialist Republic of Vietnam. Recognition of the communist Khmer Rouge regime in Cambodia came in 1975, and diplomatic relations with that country were established in 1970s. Earlier, the Japanese already gave similar funding to the South Vietnamese, which also re-established official diplomatic relations with Japan during the same period. With the re-establishment of relations between Japan and North Vietnam the Japanese agreed to resolve what are termed "unsolved problems", which after earlier negotiations in Vientiane, Kingdom of Laos, these "unsolved problems" revolved around grants given by the Japanese State to North Vietnam. Between 1973 and 1975 the Japanese and North Vietnamese governments held over 20 both official and unofficial meetings, on 6 October 1975 both sides finally reached and agreement and the Japanese would provide the North Vietnamese with an endowment worth 13.5 billion yen. Of this money, 8.5 billion yen would be used to purchase heavy farmland cultivation machinery as well as public works provided by Japanese-owned corporations. After diplomatic relations were re-established, in 1975, Japan would open an embassy in Hanoi and North Vietnam would open an embassy in Tokyo. The Japanese embassy in Hanoi was established by Yukio Imagawa, the first Chargé d'affaires ad interium to the Democratic Republic of Vietnam, and