The main theaters of operations were within Malaysian borders, primarily to fight an insurgency led by the Communist Party of Malaya (CPM) in what was known as the Emergency. The only foreign incursion of Malaysian territory in modern times were in World War II by Japan (Malaya was then not a unified political entity and consisted of the British Crown Colony of the Straits Settlements, and the British protected Federated Malay States and Unfederated Malay States) and during the Indonesia-Malaysia confrontation by Indonesia under the leadership of President Sukarno. Operations on foreign soil have mainly been peacekeeping operations under the auspices of the United Nations.