SPOILER ALERT: This story contains spoilers from Season 3 of “ The Diplomat ,” now streaming on Netflix.

We’ve met before, “The Diplomat” creator and showrunner Debora Cahn and I, with Keri Russell , in New York, before the second season of the farcical political thriller dropped. Back then, at an Upper Westside bistro, Cahn, Russell and I had lots of drinks — the kind that, Cahn says, leave you “foggy the next day, and yet you do it anyway.” “I started doing it at 17,” she says, “and here I am at 50-something still doing it.”

We don’t learn.

And that’s partly why Kate (Russell), in Season 3 of “The Diplomat,” after her marriage to Hal (Rufus Sewell) has basically ended, has taken up with a guy very much like Hal, and in part why she goes back to Hal in the last few minutes of

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