Ann Leckie, the triology starting with Ancillary Justice. There are some mysterious aliens, but they are mainly important because they beat a human military expansionist empire a thousand years ago, and they're still dealing with the aftermath and the peace terms they were forced to accept.
It definitely "shakes things up a bit". For one thing, the protagonist, Breq, is an AI who used to control a huge warship and thousands of soldier units (made from criminals and prisoners of war - waste not, want not). When the book starts the ship is dead, and she's only got only one soldier unit left.
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