This is operating on the assumption that it was someone from the North Caucasus, of course, but given the hostile environment, it wouldn't be a surprise. I didn't write about it, but last month there were a lot of nationalistic, "Russia for Russians!" type protests happening after the killing of a Spartak (Moscow soccer team) fan, that involved a lot of danger for anyone not-white (here, this largely means people from the North Caucasus/Central Asia).
Here is a news article about the airport incident: http://www.bbc.co.uk/news/world-europe-12272392 There are others, too.
I guess it's a good thing my friends and I don't regularly hang out in airports.