It hasn't been proven, but I don't think it's really subject to much dispute that Flynn wrote that article on behalf of the Turkish government. I'm sure it wasn't done as part of a hobby he has. Take it for what it's worth, but the ABC News story linked below -- which relates to the recent indictments of Flynn's associates -- indicates that Flynn's firm was paid $530,000 for its lobbying work for Turkey.
And he didn't plead to anything related to it because no charges were filed against him.
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