Now the situation is different with Russia because of what they have been doing in an effort to disrupt Ukraine. Remember, we US citizens need a visa to travel to Russia. I have an expired Russian visa in my passport and I am always questioned on my business trips as to why I went to Russia ... Especially when I enter Ukraine, Georgia, and Poland. Most Polish immigration officials know I broker their vodka so we have a good laugh.
Also, I would reconsider visiting Russia just in terms of one's personal safety. I am sure glad that I fell in love and married a Ukrainian gal. Eventhough we have not declared Russians Persona Non Grata, it is upon to the investigating officer's discretion to approve or disapprove a visa, and frankly a multitude of reasons for denial can always be found.