Assertion: seljuq empire | /r/CapableOf | lose all its eastern provinces
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text: As a result of Sanjar's failure to deal with the encroaching threat from the east, the Seljuq Empire lost all its eastern provinces up to the river Syr Darya, and vassalage of the Western Kara-Khanids was usurped by the Kara-Khitai, otherwise known as the Western Liao in Chinese historiography.