If I learn Russian, will it harm my English?

No, this shouldn't have an effect. I understand what you are concerned about but learning an language is a skill. You pronunciation and grammar should not suffer when learning a different language.
I speak two languages and have no issue going back and forth. My grammar in English is quite good. I can also speak it without mixing in pronunciation from the other language I speak.
You may slip up here and there in the beginning but once you really become fluent, it will be like walking or breathing. It will become second nature just like English is now. Think of it this way, did learning English mess up your native language with pronunciation?
I doubt it really had a profound effect and therefore you shouldn't be worried about adding an additional language. Good luck!
@bruh27777 I really don't think it will damage it. As long as you keep up with your English (which is good by the way) then you shouldn't have any issue. Take me for example, I speak English and Hindi. They are very different in alphabet and dialect.
I don't have an issue with switching mid sentence if I have to simply because I am proficient in both. I think you will find the same thing. If anything, your other language habits might hinder the Russian at first.
But you know well that practice will eventually drown that out and you will become fluent. Impressive you will speak 4!
Hindi and English are hugely different and I don't have a problem. I think that you are overly worried because of the difficulty. I honestly don't believe after you gain some fluency, you will have issues.
Nop the brain can seprate them you be fine learning Russian as well as much as I know
Nope as long as you don't only speak Russian for more then 10 years straight you should easily be able to inter change between languages
I have a couple of Russian friends who speak fluent English too, so using them as an example I have to say, no
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No. Russian is super difficult though. Not as bad as Thai or tonal languages but very difficult.
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