The West New Guinea dispute (1950–1962), also known as the West Irian dispute, was a diplomatic and political conflict between the Netherlands and Indonesia over the territory of Netherlands New Guinea. While the Netherlands had ceded sovereignty to Indonesia on 27 December 1949 following an independence struggle, the Indonesian government had always claimed the Dutch-controlled half of New Guinea on the basis that it had belonged to the Netherlands East Indies and that the new Republic of Indonesia was the legitimate successor to the former Dutch colony.