Russian food, language, and religion are better preserved by Russian communities outside Russia. Immigrants that left in 1990s as adults speak purer Russian than TV news people.
“Preserved” in the original state, like in museum - yes. Russian communities outside Russia rarely contributed anything new to it. Russian culture actively developed in last 30 years, against all odds and efforts of the state, which coincidentally wanted to freeze it or roll back in time too.
Russian language indeed borrowed a few words, but this is not a bad thing, it’s a common reflection of Zeitgeist that happened to the language before.
Russians outside Russia for the last 100 years have contributed literature, music, movies, and helped to introduce Russian cultural aspects to the West. In the past 30 years this only accelerated. Even before this war there were huge numbers of Russian intellectuals, artists, etc living in the West, but contributing to Russian culture.
I’ve been reading a lot of books in Russian, watched lots of movies and attended a lot of contemporary art exhibitions in Moscow and St.Petersburg. I’m struggling to find any traces of such contribution of emigrant communities in the last 30 years (well, maybe Akunin or Sorokin?). There are a few names from Soviet times, but they represent a fraction of what’s been happening and emigrants usually reflect on the past.
It is true that in the last 30 Russia has been absorbing American, particularly African American culture as far as music, movies, and dress are concerned. Russian culture in Russia is in decline generally.
As Russia opened more to the world, it indeed started absorbing elements of many other cultures (I do not know, why you focus on African American culture here and call its influence a decline - it sounds racist). However it does not mean it lost its unique identity and did not develop over the time. Probably, as an emigrant you just missed it and now so disconnected from the motherland that you have no idea what's actually going on there. It's much bigger than what you can find in TV news (who watches TV nowadays?!) or on a few YouTube blogs. How many contemporary Russian artists or writers do you know? What do you know about the modern internet culture of Russians, which is bigger than everything else?
Do you know what modern Russians eat and where they go for a date? Are you familiar with TV ads that were so popular that they found their way into the language? Do you know what's going on on the roads and what part of life of modern Russian is dedicated to driving a car and everything around it? What do you know about national theatrical awards and have you ever seen any winning performance?
Russian language indeed borrowed a few words, but this is not a bad thing, it’s a common reflection of Zeitgeist that happened to the language before.