The Cyprus problem, also known as the Cyprus conflict, Cyprus issue, Cyprus dispute, or Cyprus question, is an ongoing dispute between the leadership of the Greek Cypriot community in the southern portion of Cyprus, and that of the Turkish Cypriot community, situated in the north.
Initially, with the occupation of the island by the British Empire from the Ottoman Empire in 1878 and subsequent annexation in 1914, the "Cyprus dispute" referred to general conflicts between Greek and Turkish islanders.
However, the current international complications of the dispute stretch beyond the boundaries of the island itself and involve the guarantor powers under the Zürich and London Agreement (namely Greece and Turkey, and to a lesser extent the United Kingdom), the United Nations, and now the European Union as well. The now-defunct Czechoslovakia and Eastern Bloc had previously also interfered politically.
The problem entered its current phase in the aftermath of the 1974 Turkish invasion of Cyprus, occupying the northern third of Cyprus. Although the invasion was triggered by the 1974 Cypriot coup d'état, Turkish forces refused to depart after the legitimate government was restored. The Turkish Cypriot leadership later declared independence as the Turkish Republic of Northern Cyprus, although only Turkey has considered the move legal, while there continues to be broad international opposition to Northern Cyprus independence. According to the European Court of Human Rights, the Turkish Republic of Northern Cyprus should be considered a puppet state under effective Turkish occupation, and legitimately belongs to Cyprus. The United Nations Security Council Resolution 550 of 1984 calls for members of the United Nations to not recognize the Turkish Republic of Northern Cyprus.
As a result of the two communities and the guarantor countries committing themselves to finding a peaceful solution to the dispute, the United Nations maintains a buffer zone (known as the "Green Line") to avoid any further intercommunal tensions and hostilities.