Bringing this back to the top for The Bureau.
It's easily the best spy thriller I've ever seen. Nothing else comes close - and at the heart of it all is an authentic love story. It's entirely in French, so make sure you can turn on subtitles. Extremely engrossing and keeps you guessing at every turn.
A lot of the material they cover also tracks with current events, as well.
Another foreign show that I'd like to recommend - Vigil, the BBC show about a whodunnit murder mystery that takes place entirely on a nuclear submarine in modern times. The plot is extremely twisty (the murder is only the beginning of a MUCH larger storyline) and it oozes tension as there's literally no escape from the mystery on board. Big thumbs up.