No, the Saka and Sarmatians assumed those borders (in the west) decades ago and haven't budged from them. The Saka have in fact been getting absolutely trashed by the Baktrians. The Seleukids actually never lost their original easternmost province, Dayuan. Can you believe it? That's how pathetic the Saka are here.
I guess the lesson is if a faction generally isn't aggressive in your game then there's a good chance they won't attack if you ally with them.
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