With the removal of Sihanouk, the existing Kingdom of Cambodia became a republic, officially removing Sisowath Kossamak. The character of the new regime was far-right and militaristic; most significantly, it ended Sihanouk's period of covert co-operation with the North Vietnamese regime and the Viet Cong, and aligned Cambodia with South Vietnam in the ongoing Second Indochina War. The Khmer Republic was opposed within the Cambodian borders by the National United Front of Kampuchea ("Front uni national de Kampuchea", FUNK), a relatively broad alliance between Sihanouk, his supporters, and the Communist Party of Kampuchea. The insurgency itself was conducted by the CPNLAF, the Cambodian People's National Liberation Armed Forces: they were backed by both the People's Army of Vietnam (PAVN) and the National Liberation Front (NLF, better known as the Viet Cong), who occupied parts of Cambodia as part of their ongoing war with the South Vietnamese government.