In January 1996, Greece and Turkey came close to an armed confrontation over the question of which country had sovereignty over an islet in the Aegean. In July 1997, on the sidelines of the North Atlantic Treaty Organization (NATO) summit in Madrid, Greek and Turkish leaders reached agreement on six principles to govern their bilateral relations. Within a few months, however, the two countries were again at odds over Aegean airspace and sovereignty issues. Tensions remained high for months, although various confidence-building measures were discussed to reduce the risk of military accidents or conflict in the Aegean, under the auspices of the NATO Secretary General.