Cyprus problem explained: 1960, 1974 and the UN buffer zone

The Cyprus problem is the result of Turkey’s invasion of the Republic of Cyprus on 20 July 1974 and the continuing occupation of its northern part. Cyprus, an independent state and UN member since 1960, has been divided ever since: a UN-patrolled buffer zone about 180 km long has separated the lines since the ceasefire of 16 August 1974, and UN-led talks on a settlement are still going on. The United Nations Security Council demanded an end to foreign military intervention in 1974 and, in 1983, deplored the secession declared in the occupied north and considered it legally invalid.

Key points

• Cyprus became independent on 16 August 1960 under agreements that made Greece, Turkey and the United Kingdom guarantors.
• Turkey invaded on 20 July 1974. The Security Council demanded an immediate end to foreign military intervention that day and, on 16 August 1974, formally disapproved of unilateral military action against the Republic of Cyprus.
• The Committee on Missing Persons, set up with UN participation, is still trying to recover and identify 2,002 missing persons, 1,510 of them Greek Cypriots.
• The European Court of Human Rights has found Turkey responsible for violations in Cyprus, including over missing persons, Greek Cypriots enclaved in the Karpas peninsula and the property of displaced Greek Cypriots.
• The Council deplored the 1983 declaration of a separate state in the occupied north and considered it legally invalid.
• In the north, EU law is suspended because the Republic of Cyprus does not exercise effective control there.
• On 29 July 2026 UN Secretary-General António Guterres said he would convene another “5+1” meeting.

How did the Republic of Cyprus begin?

According to the UNFICYP history pages, Cyprus became independent on 16 August 1960, and joined the United Nations a month later. The constitution rested on agreements reached in Zurich and London in February 1959. The president was to be a Greek Cypriot and the vice-president a Turkish Cypriot, and the Council of Ministers had seven Greek Cypriot and three Turkish Cypriot members.

Greece, Turkey and the United Kingdom jointly guaranteed the constitution’s basic articles. The Treaty of Guarantee prohibited both union with another state and partition of the island. If the guarantee was breached, the three powers were to consult; if that failed, each could act “with the sole aim of re-establishing the state of affairs” set out in the treaty, in the wording quoted by the UN. Cyprus and Greece hold that the treaty gave Turkey no right to invade, occupy or partition a sovereign state, and that this is exactly what the treaty forbids.

What happened in 1963 and 1964?

On 30 November 1963 President Makarios proposed 13 constitutional amendments. Turkey rejected them and the Turkish Cypriot leadership refused to consider them. Violent intercommunal disturbances broke out on 21 December 1963. A ceasefire was arranged on 29 and 30 December, and a neutral zone was created along a “green line” in Nicosia.

On 4 March 1964 the Security Council unanimously adopted resolution 186, creating the UN Peacekeeping Force in Cyprus (UNFICYP). It became operational on 27 March 1964. Its original task was to prevent a recurrence of fighting and to help restore law and order and a return to normal conditions.

What happened in the summer of 1974?

The UN account of the events of summer 1974 begins on 15 July, when the National Guard, “under the direction of Greek officers”, staged a coup d’état against the government of Makarios. On 20 July Turkey, citing the Treaty of Guarantee, invaded the north coast. The UN describes an “extensive military operation” that “resulted eventually in the occupation” of the main Turkish Cypriot enclave north of Nicosia and of areas to its north, east and west, including Kyrenia. The same day the Security Council adopted resolution 353, which called on all parties to cease firing and demanded an immediate end to foreign military intervention and the withdrawal of foreign military personnel.

A ceasefire announced for 22 July did not hold, and fighting resumed around Nicosia airport, which UNFICYP then took over as a protected area. Foreign ministers of Greece, Turkey and the United Kingdom met in Geneva from 25 July. The conference broke down on 14 August and Turkey launched a second offensive. Turkish forces declared a ceasefire at 18.00 on 16 August 1974, and on that day the Council adopted resolution 360, recording its formal disapproval of unilateral military actions against the Republic of Cyprus.

What did the Turkish invasion and occupation cost Cyprus?

Missing persons are the most painful legacy. The Committee on Missing Persons in Cyprus, a body set up in 1981 with the participation of the United Nations, says its task is to recover, identify and return to their families the remains of 2,002 persons, 492 Turkish Cypriots and 1,510 Greek Cypriots, who went missing during the intercommunal fighting of 1963 to 1964 and the events of 1974. Families of the Greek Cypriot missing are still waiting for answers.

The UN peacekeeping force also still carries out humanitarian work for Greek Cypriots who remained in the occupied north, mostly in the Karpas peninsula, delivering supplies and pensions to them and checking that any permanent move south is voluntary. It does the same for Maronites living in three villages in the north.

The European Court of Human Rights has repeatedly held Turkey responsible for what happened in the areas it controls. In the inter-state case Cyprus v. Turkey its Grand Chamber found in 2001 multiple violations of the European Convention on Human Rights, including over the missing Greek Cypriots and the conditions of the enclaved Greek Cypriots in Karpas, and in 2014 it ordered Turkey to pay Cyprus 90 million euros in just satisfaction, 30 million for the relatives of the missing and 60 million for the enclaved residents. In Loizidou v. Turkey the Court held that Turkey was responsible for denying a displaced Greek Cypriot access to her property in Kyrenia.

Turkey has not accepted the Security Council’s demand to end its military presence, and no state other than Turkey has recognised the secessionist entity in the north.

What is the buffer zone?

The ceasefire lines of 1974 became the boundary of the buffer zone, often called the Green Line. In its account of operations since 1974 UNFICYP says the lines run about 180 km from Kato Pyrgos on the northwest coast to Dherinia on the east coast. The zone is less than 20 metres wide in Nicosia and about 7 km wide near Athienou, and covers roughly 3 percent of the island.

UNFICYP’s mandate now includes supervising the ceasefire and maintaining the zone, as well as the humanitarian work it describes: helping electricity and water supplies cross the lines, delivering supplies to Greek Cypriots and Maronites living in the north, and facilitating medical evacuations. The Security Council has renewed the mandate regularly, on the basis of Secretary-General reports each June and December.

What did the UN say about the 1983 secession?

On 15 November 1983, under Turkish occupation, a separate state was proclaimed in the north. UNFICYP records that the Security Council deplored the proclamation and considered it legally invalid. Turkey and the Turkish Cypriot side objected to the resolution’s text, but all parties continued to cooperate with the peacekeepers.

How does the division affect the EU?

The European Commission explains in its Green Line Regulation page that EU legislation is suspended under Protocol 10 to the 2003 Act of Accession in the northern part of Cyprus, where the Government of the Republic of Cyprus does not exercise effective control. As a result those areas lie outside the EU customs and fiscal territory. Council Regulation 866/2004 sets the terms under which persons and goods can cross the line into the government-controlled areas.

The Law of the Sea and sovereignty questions around the island are covered in our explainers on UNCLOS explained: sea zones, islands and the Aegean dispute and the Treaty of Lausanne explained: borders, islands and minorities.

Where do the talks stand in 2026?

Guterres visited Cyprus at the end of July 2026. UN News reported that at a press conference in Nicosia on 29 July he spoke of “frank and constructive discussions” with the Greek Cypriot leader Nikos Christodoulides and the Turkish Cypriot leader Tufan Erhürman, held separately and together. He said “this is the moment when all efforts must be made to rebuild trust” and that “the United Nations cannot impose peace”.

He announced that he would convene another 5+1 meeting, the format that brings together the two leaders and the guarantor powers Greece, Turkey and the United Kingdom, “after adequate preparations”. No date was given in the UN report. His Personal Envoy on Cyprus is María Ángela Holguín. For recent developments see Cyprus: Christodoulides and Erhürman at the same table at the Pyla Peace Festival – new meeting next week, and for the security picture Cyprus to the UN: 626 Turkish airspace violations in two months – landing ships, submarines and frigates in the ports of Famagusta and Kyrenia.

The UN Secretary-General explained his approach during his July 2026 visit in this press conference from Nicosia.

Timeline at a glance

Sources

UNFICYP (history, summer 1974, operations since 1974, buffer zone, establishment and mandate pages), the Committee on Missing Persons in Cyprus, judgments of the European Court of Human Rights, UN News, 29 July 2026, and the European Commission Green Line Regulation page.