Russian language is best taught in the Russian Federation. from Russian teachers. No Russian-speaking Englishman or American will teach you Russian as a native. I think you might want to consider flying to Russia for that. I have already been to that country with the help of https://www.russia-travel.com/passport/. It turned out to be easy to make documents online.
I also think that if you're going to take a vaccine, Sputnik is probably the least worst and risky since it's not using the new mRNA technology.
But I guess in Russia it will just as well to give some doctor money under the table and you'll have a fake certificate. Perhaps a good thing to combine the trip with.