On 20 July 1974, the TAF launched an amphibious and airborne assault operation on Cyprus, in response to the 1974 Cypriot coup d'état which had been staged by EOKA-B and the Cypriot National Guard against president Makarios III with the intention of annexing the island to Greece; but the military intervention ended up with Turkey occupying a considerable area on the northern part of Cyprus and helping to establish a local government of Turkish Cypriots there, which has thus far been recognized only by Turkey. The intervention came after more than a decade of intercommunal violence (1963–1974) between the island's Greek Cypriots and Turkish Cypriots, resulting from the constitutional breakdown of 1963. Turkey invoked its role as a guarantor under the Treaty of Guarantee in justification for the military intervention. Turkish forces landed on the island in two waves, invading and occupying 37% of the island's territory in the northeast for the Turkish Cypriots, who had been isolated in small enclaves across the island prior to the military intervention.