Do you think blacks could withstand something like the assault of wehrmacht on soviet union? Together with the conditions they had to go through, from bitter cold to starvation, yet keeping their will strong? Nah, blacks would submit long ago, like they always submit to conquerors.
Russian's ofc. Just count how many of them died during the 20th century. 5m dead in ww1. 10m during the civil war. another 5-10 during Stalin purges. 20+m in ww2. Any other country would cease to exist if they experienced a portion of their hardship.
The most scared I have ever been in my entire life was this time I was in this Russian bar in Vietnam (which was a front, I'm sure). I befriended the girl bartender who worked there (who was also Russian). She was pretty plain, but the Russian guys who ran the joint (who were huge and definitely mafia) thought I was interested in her and chatted me up over vodka in order to scare the shit out of me. It was pretty scary to hear them go back and forth with the girl in Russian who was clearly on the defensive.
They were really friendly but also ominous at the same time. I can't say I've ever been that scared of any black even though blacks can definitely be scary.