United Malays National Organisation
The Philippines and Indonesia strenuously objected to this development, with Indonesia claiming Malaysia represented a form of neocolonialism and the Philippines claiming Sabah as its territory. The United Nations sent a commission to the region which approved the merger after having delayed the date of Malaysia's formation to investigate. Despite further protests from the Indonesian President, Sukarno, the formation of Malaysia was proclaimed on 16 September 1963. Indonesia then declared a "confrontation" with Malaysia, sending commandos to perform guerilla attacks in East Malaysia (Sabah and Sarawak). The confrontation was ended when a military coup replaced Sukarno with Suharto. The Philippines, which had withdrawn diplomatic recognition from Malaysia, also recognised Malaysia around the same time.
Indonesia–Malaysia confrontation
North Borneo and Sarawak, anticipating a pro-Malaysian UN report, declared their independence as part of Malaysia on the sixth anniversary of Merdeka Day, 31 August 1963, even before the UN report had been published. On 14 September the UN report was published, once again providing general endorsement of the proposed Malaysian state. Malaysia was formally established on 16 September 1963. Indonesia immediately reacted by expelling the Malaysian Ambassador from Jakarta. Two days later, rioters organised by the PKI burned the British embassy in Jakarta. Several hundred rioters ransacked the Singapore embassy in Jakarta and the homes of Singaporean diplomats. In Malaysia, Indonesian agents were captured, and crowds attacked the Indonesian embassy in Kuala Lumpur.