Why would Russians have perfect spoken grammar and yet terrible accent in Hollywood movies? [closed]

Being a native Russian speaker and a linguist/polyglot I have always been fascinated by fake Russian accents in Hollywood movies. My question was always why would you cast a Serbian, Bulgarian or some other actor of Southern Slavic descent when you can find plenty of Russian speaking actors. I guess because Southern Slavic, Hungarian, Romanian accents sound so distinct they became a stereotypical accent in Hollywood movies. If you want to hear how a real Russian person would sound then listen to Armie Hammer in Man from UNCLE, he perfected it, it was so spot on.

Back to your question. Because actors say what's in the screenplay which is usually written by native English speakers, they just memorize it. And because directors/writers are not linguists they don't bother thinking of such small things like a discrepancy between harsh accents and grammar, which logically should be somewhat on par with each other, to make it more realistic. And nobody really notices it or complains about it. There are of course people who have strong accents, and have perfect grammar, yet in majority of cases a strong accent usually implies bad grammar, but as your grammar improves so does your accent not because there is a correlation between the two, it's because you practice more. Of course this not true for all movies.

Now if a director wanted to incorporate both bad grammar and a heavy accent, it can easily be done without sacrificing intellgibility e.g. I come tomorrow to killing you or You watching your back from now. It would probably make it even more entertaining. Characters with heavy accents usually speak in short sentences and don't go into long philosophical discourses.

First and foremost, characters are a vehicle for entertainment.

This means that if entertainment or realism must be sacrificed then realism is cut. Tied into this is the fact that things are put into a movie for a reason. If the writers decided that character X needs to be Russian for Y reason then the character has to be obviously Russian. An easy way to make someone obviously Russian is to give them a horrible accent like we've seen other "Russians" sporting in movies. Now if these "Russians" had really bad grammar/word choice to go with this heavy accent it would be harder for the audience to understand, and result in awkward choppy dialogue. The times when characters demonstrate poor grammer/word choice/comprehension it is often for comedic effect. This is because reality is subservient to entertainment.

My wife is from Peru and she speaks pretty good English. It isn't perfect by any means but it is solid. In my experience with her and other first generation Americans/immigrants it is word choice that is harder than grammar when you deviate from your normal daily script. In English we differentiate fingers from toes. In Spanish fingers and toes go by the same word "dedos." Since people talk about their fingers more than their toes it is easier to replace "dedos" with "fingers" when she is speaking. Without a doubt my wife knows the words toes and fingers. She will always construct a grammatically correct sentence but sometimes when she is distracted she will say things like "foot fingers" when she really means "toes."