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Emperor Taizong of Tang (r. 626-649), the second emperor of Chinese dynasty Tang Dynasty, faced a major threat from Tang's northern neighbor, the Eastern Turkic Khaganate, whom his father Emperor Gaozu of Tang had been subjugated by in several manners.
Emperor Taizong of Tang (r. 626–649) of Tang Dynasty China, after subjugating the Eastern Turkic Khaganate, began to exert his military power toward the Western Regions, then dominated by the Western Turkic Khaganate as well as a number of city-states loosely allied with the Western Turkic Khaganate.
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In contrast to its eastern cousin Eastern Turkic Khaganate, Western Turkic Khaganate did not pose a major threat to Tang Dynasty in the early years of Tang's existence, as it was farther from Tang territory and not attacking Tang.
The Göktürk civil war (or Turkic interregnum) was an important crisis in Central Asia during the 580s, which resulted in the split of the Göktürk Khaganate and the creation of separate western and eastern khaganates.
In foreign policy, Kutlug Bilge Kaghan maintained alliance with the Tang China, started at the China behest in its fight against the Eastern Turkic Khaganate.
Chebi Khan (fl. 630-650), a claimant of the title of khan of Eastern Turkic Khaganate after the collapse of Xueyantuo
By 627, Emperor Taizong, hearing this, was contemplating attacking the Eastern Turkic Khaganate, and he consulted the chancellor Xiao Yu and his brother-in-law Zhangsun Wuji.
At the same time, however, Xueyantuo, which had been a vassal of both the Eastern Turkic Khaganate and the Western Turkic Khaganate at times, was beginning to strengthen, as was another vassal of the Eastern Turkic Khaganate, Huige, and Ashina Duobi was unable to defeat or contain them.