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... In lieu of Turkic/Mongol migrations.
In OTL, the Tungusic peoples (among whom the Jurchens/Manchus are probably the most notable example) emerged in much the same region as the Turks and Mongols, but seemed far more fond of messing with China than moving west...
What would prompt a Tungusic migration westward, and what might be some effects of that? Where would they most likely end up?
Bonus points if you have the Tungus absorb the Turks as they move, rather than vice-versa.