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my 2c: Reading Thucydides is great, but if you are just reading Melian Dialouge with them whats the point. You either spend three weeks on the thing and couple it with side readings to provide historical context and produce excellent questions to ponder or just don't do it
The way it is taught in IR is more like "Here is the section that everyone quotes; we will read it so that you understand the reference next time people quote it."
That's stupid, it is less about carefully examining the history or taking Thucydides seriously as a theorist than it is setting up disciplinary boundaries and creating shared lingo
If Thucydides isn't worth three weeks of your specific course than he is not actually relevant to your course.
Anyways, if you want an idea of what I think adding Thucydides to a foreign policy oriented course might look like, I made this syllabus for fun a few years ago. Never finished it, but gives you an idea of how I see it working https://twitter.com/Scholars_Stage/status/1276327596247191555
