Indonesia–Malaysia confrontation of the action occurring in the border area between Indonesia and East Malaysia on the island of Borneo (known as Kalimantan in Indonesia). The conflict was characterised by restrained and isolated ground combat, set within tactics of low-level brinkmanship. Combat was usually conducted by company- or platoon-sized operations on either side of the border. Indonesia's campaign of infiltrations into Borneo sought to exploit the ethnic and religious diversity in Sabah and Sarawak compared to that of Malaya and Singapore, with the intent of unraveling the proposed state of Malaysia. The challenging jungle terrain of Borneo and lack of roads straddling
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