The Indonesia–Malaysia confrontation Hostile_encounter or Borneo confrontation ( also known Know by its Indonesian/Malay name , Konfrontasi ) was a violent conflict Hostile_encounter from 1963–66 that stemmed from Indonesia 's opposition to the creation of Malaysia .

The creation of Malaysia was the amalgamation of the Federation of Malaya ( now West Malaysia ) , Singapore and the crown colony/British protectorates of North Borneo and Sarawak ( collectively known as British Borneo , now East Malaysia ) in September 1963 .

The creation of Malaysia was the amalgamation of the Federation of Malaya ( now West Malaysia ) , Singapore and the crown colony/British protectorates of North Borneo and Sarawak ( collectively known as British Borneo , now East Malaysia ) in September 1963 .

The confrontation was an undeclared war Hostile_encounter with most of the action occurring Coming_to_be in the border area between Indonesia and East Malaysia on the island of Borneo ( known as Kalimantan in Indonesia ) .

Indonesia 's campaign Military_operation of infiltrations Attack 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 Resolve_problem the proposed Creating state of Malaysia .

The jungle terrain of Borneo and lack of roads straddling Surrounding the Malaysia–Indonesia border forced Causation both Indonesian and Commonwealth forces Military_operation to conduct Action long foot patrols Patrolling .

A build-up of Indonesian forces Military_operation on the Kalimantan border in December 1964 saw Self_motion the UK commit Commitment significant forces Military_operation from the UK-based Army Strategic Command and Australia and New Zealand deployed Arranging roulement combat Hostile_encounter forces Military_operation from West Malaysia to Borneo in 1965–66 .

Furthermore , maintenance of the high number of Malays in Malaysia was addressed Expressing_publicly by the inclusion of Borneo island 's regions Sabah and Sarawak into the Malaysian federation .

This was the first time Brunei hosted Social_event the Southeast Asian Games Competition and also in Borneo island .

The group , calling themselves the `` Royal Security Forces of the Sultanate of Sulu and North Borneo '' , was sent Sending by Jamalul Kiram III , one of the claimants to the throne of the Sultanate of Sulu .

Kiram III stated Statement that their objective Aiming was to assert Statement the unresolved territorial claim Statement of the Philippines to eastern Sabah ( the former North Borneo ) .