The conflict in Portuguese Guinea involving the PAIGC guerrillas and the Portuguese Army would prove the most intense and damaging of all conflicts in the Portuguese Colonial War, blocking Portuguese attempts to pacify the disputed territory via new economic and socioeconomic policies that had been applied with some success in Portuguese Angola and Portuguese Mozambique. In 1965 the war spread to the eastern part of Guinea; that year, the PAIGC carried out attacks in the north of the territory where at the time only the Front for the Liberation and Independence of Guinea (FLING), a minor insurgent group, was active. By this time, the PAIGC had begun to openly receive military support from Cuba, China and the Soviet Union.