With a new Cold War already ramping up, you can bet all your remaining pennies that every country is spying on the other with even more enthusiasm than normal. And for a sense of what that actually entails, you should go watch Tinker, Tailor, Soldier, Spy.
The film is set during the height of the Cold War, with the protagonists (obviously) being the Brits and the Russians, with a few other Soviet Bloc countries thrown in there for good measure. It's an adaptation of a 1974 book by John le Carre. Notably, it eschews the normal spy-movie format of GUNS SEX GUNS EXPLOSIONS for a plot full of political intruige, tight plot lines and exemplary writing. The most exciting action is probably a man stealing a file from a library. [Netflix]