 After a brief lull, Kublai Khan in 1281 turned his attention to Southeast Asia, demanding tribute from Pagan, the Khmer Empire, Đại Việt and Champa.When the Burmese king again refused, the emperor ordered an invasion of northern Burma.Two dry season campaigns (1283–85) later, the Mongols had occupied down to Tagaung and Hanlin, forcing the Burmese king to flee to Lower Burma.