You need not get tangled up in taxa used in current taxonomy (species, formenkreis, race, breed..), but that is an interesting topic covered very well in this book. https://z-lib.sk/book/69NK8Wy7zY/race-by-john-r-baker.html
Russian and Spanish culture are indeed different, but they are different races with different admixtures. Under the caucasoid race, the subrace Europid has 4 subraces: celtic, germanic, baltic, and slavic.
Spanish are largely germanic with some celtic from the Visigoths who conquered the celtic people a long time ago. During the long occupation of the moors, some limited mixing with arabs (a mixed race people) occurred.
Russia was mostly slavic but was often ruled by germanic people such as vikings who mixed with them. They have had much mixing with the mongoloid race. Mongols and Huns conquered and occupied Russia at times and mixed with them for example.
Despite these differences in subraces and some non-Europid admixture, Russian culture and civilization is much more similar to the Spanish than it is to any culture you find in Africa or East Asia.
Some people are indeed more racially pure than others. Most capoids have never bred with congoids/negrids. Some celts have never bred with germanics to make them still purely celtic. I can trace my lineage to celtic and germanic which makes me nordic under Europid.
If you moved all the people from Japan to the Congo and moved all the people of the Congo to Japan, what would both places look like afterwards? The Congo would have beautiful temples, art, literature, and civilization similar to current Japan. The island of Japan would look more like Haiti.
Don't deny what you can easily observe because it may disagree with your ideology. Don't deny the findings of genetics that further prove what causes the difference between populations of humans.
