federation called Malaysia, and found that the union was generally favoured by the people. Most ethnic community leaders of Sabah, namely, Mustapha Harun representing the native Muslims, Donald Stephens representing the non-Muslim natives, and Khoo Siak Chew representing the Chinese, would eventually support the union. After discussion culminating in the Malaysia Agreement and 20-point agreement, on 16 September 1963 North Borneo (as Sabah) was united with Malaya, Sarawak and Singapore, to form the independent Malaysia. From before the formation of Malaysia until 1966, Indonesia adopted a hostile policy towards the British-backed Malaya, leading after union to the Indonesia–Malaysia confrontation. This undeclared war stemmed from what Indonesian President Sukarno perceived as an expansion of British influence in the region and his intention to wrest control over the whole of Borneo under the Greater Indonesian concept. Meanwhile, the Philippines, beginning with president Diosdado Macapagal on 22 June 1962, claims Sabah from cession by heirs of the Sultanate of Sulu. Macapagal, considering Sabah to be property of the Sultanate of Sulu, saw the attempt to integrate Sabah, Sarawak and Brunei into the Federation of Malaysia as "trying to impose authority of Malaya into these states". Following the successful formation of Malaysia, Donald Stephens became the first chief minister of Sabah. The first Governor Yang di-Pertua Negara (which later changed to Yang di-Pertua Negeri in 1976) was Mustapha Harun. The leaders of Sabah demanded that their freedom of religion be respected, that all lands in the territory be under the power of state government, and that native customs and traditions be respected and upheld by the federal government; declaring that in return Sabahans would pledge their loyalty to the Malaysian federal government. An oath stone was officially officiated by the first Chief Minister Donald Stephens on 31 August 1964 in Keningau as a remembrance to the agreement and promise for reference in the future. Sabah held its first state election in 1967. In the same year, the state capital name of "Jesselton" was renamed to "Kota Kinabalu". An airplane crash on 6 June 1976 killed Stephens along with four other state cabinet ministers. On 14 June 1976, the state government of Sabah led by the new chief minister Harris Salleh signed an agreement with Petronas, the federal government-owned oil and gas company, granting it the right to extract and earn revenue from petroleum found in the territorial waters of Sabah in exchange for 5%