Final answer:
The most polite way to address Natalya Stepanovna Chubokova in Russian would be using her full name.
Step-by-step explanation:
The most polite way to address Natalya Stepanovna Chubokova in Russian would be using her full name- Natalya Stepanovna Chubokova. In Russian culture, it is common to use full names when addressing someone as it shows respect and formality.