Northern Cyprus nationality law governs the acquisition, transmission, and loss of Northern Cyprus citizenship. Naturalized Northern Cyprus citizens are persons granted citizenship by the de facto Government of Northern Cyprus, which is recognized only by Turkey. Viewpoint of the Republic of Cyprus It has been the policy of the de facto state of Northern Cyprus to encourage non-Greek immigration into the country, as decided upon shortly after the Declaration of Independence of the Turkish Republic of Northern Cyprus to increase their numbers relative to the population of the Greek-Cypriots in the Republic of Cyprus. Most of the immigrants come from the Anatolia region of Turkey, but a few others from the United Kingdom come to live in Northern Cyprus in order to take advantage of property sales. No immigration is permitted, however, that would threaten the demographic status of the ethnic Turkish majority. It is estimated that Turkish settlers in Northern Cyprus and their children currently make up about 50% of the population in the de facto state, but the number of naturalizations remains unknown. The Government of the Republic of Cyprus views the immigration policy of Northern Cyprus as a means to upset the island's demographics, and as a theft of Greek-Cypriot owned property. They, therefore, officially regard any naturalized Northern Cyprus citizens as 'illegal settlers', who would be subject to deportation in the event of Cypriot reunification. It is the policy of the Republic of Cyprus to refuse naturalized Northern Cyprus citizens entry into the Republic of Cyprus through the Green Line checkpoints since they have entered into Cyprus through what is considered as an unlawful port of entry. The refusal of entry to the Republic mainly applies to the Turkish settlers, as Turkish citizens of Turkey are permitted to enter the Republic of Cyprus, only through the lawful ports of entry. The Republic of Cyprus has declared any Northern Cyprus seaport or airport to be an unlawful port of entry; however, in practice, Ercan Airport is used as the principal civilian airport of Northern Cyprus, and the same applies to the ports of Famagusta and Kyrenia. Furthermore, the government of the Republic of Cyprus considers the immigration policy of Northern Cyprus to be in violation of Article 49 of the Fourth Geneva Convention of 1949 ("Relative to the Protection of Civilian Persons in Time of War"), which prohibits the transfer by an occupying power of its own