Sui Yangdi
In order to buttress his position, Ishbara of the Eastern Khaganate applied to Emperor Yang of Sui for protection. Tardu attacked Chang'an, the Sui capital, around 600, demanding Emperor Yangdi end his interference in the civil war. In retaliation, Chinese diplomacy successfully incited a revolt of Tardu's Tiele vassals, which led to the end of Tardu's reign in 603. Among the dissident tribes were the Uyghurs and Xueyantuo.