Indonesia–Malaysia confrontation

The Indonesia–Malaysia confrontation or Borneo confrontation (known as Konfrontasi in Indonesia, Malaysia and Singapore) was an armed conflict from 1963 to 1966 that stemmed from Indonesia's opposition to the creation of the state of Malaysia. Vital precursors to the conflict included Indonesia's policy of confrontation against Dutch New Guinea from March to August 1962 and the Indonesia-backed Brunei revolt in December 1962.

Source: Wikipedia — Indonesia–Malaysia confrontation (CC BY-SA 4.0)