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I remember a story of a Russian teacher of the Rus. language in Germany who asked her pupils to call her Maria Ivanovna, and they were reluctant to do so because they thought it was impolite to call...

MikeM is perfectly correct, I only want to add a bit.

You can say господин (госпожа) + last name, but it is used only when you are speaking about a third person and even then it sounds very...