Fast & Furious 8: 23 WTF Moments In The Fate Of The Furious
4. "No Smoking"
During the Russian submarine sequence, Letty and Ramsey - who doesn't have a great deal to do throughout the film, in all honesty - break into the weirdly still fully functional control room that is somehow EMP proof in order to hack into the submarine, so Ramsey and Cipher can play Whose Hack Is Better while they compliment each other over their coding cunning.
While there, Letty battles a couple of Russian thugs - we know they're Russian because they're instructed to do things in Russian and they have clearly been cast because of a general Russianness to them.
What's slightly confusing about this whole situation is the fact that the Russian control room controlling the Russian sub with the Russian goons in it has a gigantic No Smoking sign in English on the wall. It's particularly odd, since there's a whole bit about all the sub's controls being in Russian too...