Turkey invaded Cyprus in 1974 and is still holding 1/3 of northern part of the island. In the meantime 300000 settlers from Turkey were placed in the occupied areas changing its demographics (who are basically now more than the Turkish Cypriots the invasion was supposed to protect). Turkish Cypriots are culturally different from mainland Turks (they are described as the most progressive Muslim population in the world). The island's internationally recognised government in the south (the Republic of Cyprus) is a full member of the EU since 2003 and can veto Turkey's accession. In the meantime Turkey does not recognise the Republic of Cyprus and that's one of the reasons negotiations with EU have been on halt for years now.