Turkish intervention was driven by the assertive foreign policy of Bülent Ecevit, its prime minister, who was supported by his junior coalition partner. Turkey decided upon unilateral action after an invitation for joint action, made under the Treaty of Guarantee, was declined by Britain. On 20 July, Turkey invaded Cyprus with limited forces. The invasion achieved limited initial success, resulting in Greek forces occupying Turkish-Cypriot enclaves across the island. Within two days, Turkey secured a narrow corridor linking the northern coast with Nicosia, and on 23 July agreed to a cease-fire after securing a satisfactory bridgehead.