On the diplomatic level, the first armistice of the First Balkan War was signed between Bulgaria, Serbia and Montenegro on the one side and Turkey on the other, on 20 November/3 December 1912.

Greece continued to pursue the war in Epirus and the Aegean. At the beginning of December the Great Powers met in London for a conference aiming to establish peace. The Balkan states claimed all European territories of the Ottoman Empire, to the west of the line formed by Midia in the Black Sea and Raidestos in the Hellespont, the peninsula of Gallipoli being excluded. These terms were not accepted by the Sublime Porte. The ensuing events such as the capture of Ioannina and other Balkan cities put more pressure on the Turkish side. Thus, on 7/ 30 May 1913 the preliminary Treaty of London was signed, providing for the ceding by the Sultan of all the areas to the west of the line Midia-Ainos (on the Aegean coast), his renouncement of all claims to Crete and the transfer of responsibility for the Aegean islands and the peninsula of Athos to the Great Powers. This Treaty did not contain any clear references to the arrangement of borders between the Balkan states in the recently-acquired territories nor did it resolve the issue of the existence or not of an Albanian state. These issues would be finally resolved with the Second Balkan War.