He only cares about becoming the Knight of One in order to gain jurisdiction over Japan. He isn't really concerned with the rest of the world. Infact, he's responsible for many EU nations falling to Brittannia as Knight of Seven.
And he works with Schneizel simply because he sees it as the quickest means to becoming KoO, and by then, he's finally acknowledged that it's about the results. Of course, Suzaku's never really known what he's doing, as he's been constantly been used by Charles and Schniezel.
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