There're no EORs (Employer of Record) like Deel etc. operating out of Russia so they'd need you to be legally/officially registered at the very least in Russia.

I know someone who did the same and then spend ~6-7 months outside Russia. Within RU, they work remotely and have never visited the office even. As a sidenote, not only did they get the job, but their income progression has been 1.5x since they joined as a newbie within 1 year.