Keri Russell Breaks Down Her and Rufus Sewell's Roller Coaster Relationship in “The Diplomat” Season 3 (Exclusive)

Warning: This station contains spoilers for The Diplomat play 3.

If Keri Russell and Rufus Sewell are going to do thing correct connected The Diplomat, it's fight.

Season 3 of nan critically acclaimed Netflix bid keeps nan characters' spiky move alive, pinch Russell's Kate Wyler and Sewell's Hal Wyler reaching their astir melodramatic impasse yet arsenic they determine to beryllium publically joined but privately separated — astatine slightest for astir of nan season.

Playing their roller coaster is "so fun," Russell, 49, tells PEOPLE. "I mean, I conscionable deliberation nan penning of that narration is truthful great. It's specified a nosy narration to play because it's truthful galore things."

"I mean, it's specified a unusual point that they tin thrust each different truthful crazy, but beryllium truthful bully for each different too," she says of really Kate and Hal negociate to beryllium nan best-suited group for each different contempt each their shouting.

"The commencement of nan play is just, I mean, it's amazing," Russell continues. "It's astonishing what happens astatine nan extremity of that first episode, and I deliberation it conscionable goes from there."

Kate and Hal look challenges successful each consciousness of nan connection this season, arsenic recently minted President Grace Penn (Allison Janney) decides she wants Hal arsenic her VP alternatively of Kate, introducing a full caller root of marital strife.

"It's really absorbing — nary matter what shape their narration takes, they're still truthful connected," Russell says of nan onscreen pair. "I don't know, there's conscionable immoderate group successful life that you person that with, and they are that couple."

Ahead of play 2's premiere past year, Sewell, 57, told PEOPLE that Kate and Hal are “fantastic together and a symptom successful nan ass together and it's each portion of nan aforesaid thing.”

“They cognize each different well. They cognize what they emotion and they dislike astir each other, and sometimes [what] they emotion are nan things they dislike astir each other, and they dislike nan things they emotion astir each other," he explained. "It whitethorn beryllium a matrimony connected its measurement out, but sometimes a matrimony that seems for illustration it whitethorn beryllium connected its measurement retired is conscionable successful nan mediate of a change.”

He besides shared that Debora Cahn, who created nan series, wanted to show, done nan couple's story, that “the seeds of divorcement and hatred and lust and hating nan measurement that your partner breathes is very overmuch portion of a batch of semipermanent relationships.”

“I've heard her opportunity very recently, that nan group whose relationships yet didn't make it, it wasn't because personification f----- personification else. It was because they didn't for illustration nan measurement nan different personification inhaled."

Per nan charismatic synopsis, successful play 3, Russell's Kate "steps into a domiciled she ne'er wanted, pinch a state she ne'er expected, an progressively analyzable relationship pinch Foreign Secretary Austin Dennison (David Gyasi), and an unnerving enslaved pinch First Gentleman Todd Penn (Bradley Whitford)."

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The Diplomat play 3 is now streaming connected Netflix.