Emily Tannenbaum Fans of FX’s popular Cold War drama “The Americans” will undoubtedly check out “The Diplomat” in the hopes that Keri Russell’s next political thriller can fill the heart-pumping void the hit series left behind in 2018. They shouldn’t — at least, not for that reason. Though “The Americans” and “The Diplomat” share a star, as well as a similar focus on marital power struggles, the new series from “Homeland” executive producer Debora Cahn is less gritty spy thriller and more soapy workplace drama. Throughout the show’s eight, hour-long episodes, I found myself thinking of “The Diplomat” as a Shondaland-inspired take on “The West Wing,” which makes sense considering Cahn cut her teeth as a writer on both “Grey’s Anatomy” and Aaron Sorkin’s NBC series.