Indonesia–Malaysia relations of Malaysia, Singapore, and Brunei. The diplomatic relations between the Republic of Indonesia and Federation of Malaya were established promptly after Malaya's independence from Britain in 1957. However, the relations between the two nations deteriorated under Indonesian President Sukarno in 1962 (see Indonesia–Malaysia confrontation, see Indonesian withdrawal from the United Nations). The conflict resulted from Indonesian opposition to the formation of Malaysia, a merger of the Federation of Malaya with two former British colonies on Borneo: Sarawak and Sabah. The conflict has led to the termination of diplomatic relations on 17 September 1963. After the fall of Sukarno, relations between
Indonesia–New Zealand relations Federation of Malaysia as a means of perpetuating British imperialism in Southeast Asia. Sukarno was also sympathetic to the Brunei People's Party's failed revolt in Brunei and was buoyed by the success of Indonesia's "confrontation" policy against Dutch New Guinea and the Philippines reviving its territorial claim to the Malaysian state of Sabah. Throughout the Indonesian-Malaysian Confrontation, Indonesia waged an undeclared border war against Malaysia and sent armed parties on cross-border operations into the East Malaysian states of Sarawak and Sabah, which bordered Indonesia's Kalimantan provinces. In September 1964, Indonesian extended its infiltration operations to peninsular Malaysia. New Zealand agreed