Greek Prime Minister Alexis Tsipras, background right, and his Macedonian counterpart Zoran Zaev, background left, look on as Greek Foreign Minister N

Greek Prime Minister Alexis Tsipras, background right, and his Macedonian counterpart Zoran Zaev, background left, look on as Greek Foreign Minister Nikos Kotzias, right, and his Macedonian counterpart Nikola Dimitrov sign an agreement on Macedonia's new name in the village of Psarades, Prespes Greece, on Sunday, June 17, 2018. (AP Photo/Yorgos Karahalis)

Greek Prime Minister Alexis Tsipras, background right, and his Macedonian counterpart Zoran Zaev, background left, look on as Greek Foreign Minister Nikos Kotzias, right, and his Macedonian counterpart Nikola Dimitrov sign an agreement on Macedonia’s new name in the village of Psarades, Prespes Greece, on Sunday, June 17, 2018. (AP Photo/Yorgos Karahalis)