 The second invasion of Đại Việt failed to accomplish its goals, and the Yuan launched a third invasion in 1287 with the intent of replacing the uncooperative Đại Việt ruler Trần Nhân Tông with the defected Trần prince Trần Ích Tắc.By the end of the second and third invasions, which involved both initial successes and large losses for the Mongols, the Đại Việt and Champa decided to accept the nominal supremacy of the Yuan dynasty and serve as tributary states in order to avoid further conflicts.By the 1250s, the Mongol Empire controlled large amounts of Eurasia including much of Eastern Europe, Anatolia, North China, Mongolia, Manchuria, Central Asia, Tibet and Southwest Asia.