My Russian fiance and I are in the USA right now, we will marry next week. We went through U.S. Embassy in Jerusalem, Israel. Ask me any questions you would like, I may have an answer.
The police certificate requirements are very vague. It has added complexity due to Russia giving out electronic copies of police certificates instead of signed paper copies. It scares couples, including my fiance and I. I was so worried about this, I paid a lawyer to help me figure it out, due to the fact that we only had an electronic police certificate. The lawyer told me I would have to ask U.S. Embassy Jerusalem. I contacted the Embassy, and they gave me no straight answer either. In the end, we had to use the electronic police certificate, which was accepted as okay. I would be very careful with the police certificate, it is a hard requirement and I've heard about people having their cases be delayed until they showed the proper document.
Here is the website that shows the exact requirement for police certificates, although it is still vague, it's the official instructions. https://travel.state.gov/content/travel/en/us-visas/Visa-Reciprocity-and-Civil-Documents-by-Country/RussianFederation.html
Absolutely be careful about 6 months. Some people say it's cumulative, but I've never tested it. Nothing would be worse than needing a police document from a country that you are not a resident from.
Please any experts correct me if I am wrong.
Something you may have not considered, is that the Israeli Border Guard will absolutely be suspicious of your entry into the country. There is a lot of Ukrainian refugees going to Israel daily. I was absolutely held up in customs for hours and I had to have a one on one talk with a border guard where I had to prove the reason my Russian fiance was in Israel. Just show them the bunches of paperwork you'll be bringing as well as other proof that you're in Israel to visit the U.S Embassy, and everything should be fine.