The Treaty of Lausanne emerged as a milestone in Greek-Turkish strategic relations. It ended a period of prolonged armed conflict and heralded an expected transition of Greek-Turkish strategic convergence. Less than a decade after the Treaty of Lausanne, the two countries faced common security threats from Bulgaria and Italy and pledged cooperation on averting revisionist visions and consolidating peace and stability. In the aftermath of the Second World War, the Soviet Union became the new joint security threat triggering the entry of Greece and Turkey into NATO. The outbreak of the Cyprus problem, nevertheless, transformed the strategic relationship between Greece and Turkey into one of strategic competition. A common normative framework is essential for restoring Greek-Turkish relations to their post-Lausanne level.