Tension began in 1963 when Makarios proposed thirteen amendments to the constitution of the Republic of Cyprus. Turkish Cypriots were opposed to the proposal since they viewed it as an attempt to remove their constitutional safeguards that Greek Cypriots had claimed to be problematic in the conduct of government. On 21 December 1963, clashes between Greek Cypriots and Turkish Cypriots erupted unleashed a wave of violence across the island. Facing violence from Greek Cypriot paramilitaries, in favour of unification with Greece (Enosis), thousands of Turkish Cypriots fled their properties to enclaves with Turkish Cypriot majorities, protected by Turkish troops. By 1974, an attempted coup sponsored by the military Greek military junta of 1967-1974 then ruling Greece, trying to overthrow the Cypriot government and unite the island with Greece, was met with a military invasion of the island by Turkey, which claimed it was acting as a guarantor power to prevent annexation of the island. Turkey's subsequent decades-long occupation of northern Cyprus has attracted widespread international condemnation.