Part of the role of a government apparatus is to enforce social norms. Culture plays a similar role. They aren't the same thing, but they do have similar attributes.
Please note that I am not criticizing any governments or culture; I merely wonder why we're OK with nationalism like this, but not racism.
> I merely wonder why we're OK with nationalism like this, but not racism.
I'm not appealing to nationalism? "Russia" could be a stand-in for any controlled territory.
For example many businesses that trade online in the US attempt to exclude people from the Eastern District of Texas in their terms and conditions. Why? Because the courts there are very friendly to plaintiffs in patent cases and they'd prefer not to get sued in that jurisdiction.
That district is causing a negative externality to people outside of it, so they refuse to do business with it.