Most copyright questions at this site are close. This one is not. Your work, in any of the permutations you suggested, would clearly infringe the copyright of the original song copyright owners as a derivative work.
You can probably get a compulsory license to make an English language cover of the Russian language song (apart from the fact that any kind of commercial transaction with Russia is ticklish right now given Ukraine war related sanctions). But you would still have to pay the copyright owner a licensing fee under the relevant compulsory licensing process.
As a practical matter, to comply with that process, you'll need a lawyer, at least the first time you do it, to learn how it is done.
Significantly inferior versions already getting millions of hits on
YouTube, and not taken down after 5yrs+.
People have their legal rights violated every day and do nothing about it most of the time.
You can brazenly violate copyright laws (or any other laws for that matter) and take a chance that no one will try to enforce their rights against you. Sometimes, maybe even usually, you'll get away with it.
But, ultimately, that isn't a legal question. That is a question about how people will choose to behave in the future for economic reasons that are far beyond the scope of the law and the legal rights of the people involved.
At this point when you know you are violating the law if you don't get a license, it is similar to making a decision to shoplift, which is also clearly illegal. Maybe you'll get caught, maybe you won't, and maybe if you do get caught they'll let you off with a warning. You have to weigh that risk and make your own decision.
