In 1983 the Turkish community in Northern Cyprus declared the independence of the Turkish Republic of Northern Cyprus (TRNC). Following UN Security Council Resolution 541 (1983) which declared the purported secession from Cyprus invalid, the TRNC has remained unrecognised by all States except Turkey, on which it is heavily dependent, militarily and economically. The TRNC and the Government of Cyprus-controlled area of Cyprus are separated by a buffer zone under a UN peacekeeping force. Authorities on both sides restrict movement through the buffer zone.