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
Brunei–Malaysia border of Boundaries) Order in Council 1958. In 1979, Malaysia published a territorial waters and continental shelf map showing the area claimed by Brunei as its continental shelf/EEZ as belonging to Malaysia. The map also depicts the Brunei-Malaysian border as only running up to the 100 fathom isobath. Brunei does not recognise the assertions made by Malaysia. In 2000, Brunei had earlier awarded a concession for a petroleum block called Block J to Shell, Mitsubishi and ConocoPhillips and Block K to France's Total, BHP Billiton and Hess Corp. Subsequently, in 2003, Malaysia's national petroleum company Petronas awarded concessions to its subsidiary