In early Soviet Russia, chess was closely associated with sagacious leadership. Now today, Russians do not dominate world chess, but they formerly were very much successful. The underlying reason for such lies in the great institutional support for chess Soviets formerly had. Many state entities sponsored chess. You'll notice that many of the Warsaw countries also appreciate chess.
“We must finish once and for all with the neutrality of chess. We must condemn once and for all the formula "chess for the sake of chess", like the formula "art for art's sake". - Nikolai Krylenko
Because it is their national sport? Over here it's soccer, and we usually beat them at that.
A joke surely? Chess isn't their "national sport" - soccer (football) is. Like pretty much every nation other than the US.
Then sports like tennis, ice hockey, basketball and all those ones. Especially nowadays as the mystique of chess in the Soviet days is gone and they become more westernized but it was never one of the big, actual sports.
Chess comes very, very far down the list, something like darts. Now of course it is popular in Russia in comparison to the west but that's not meaning that it's some huge thing there, let's not go crazy. It's not on pay tv with big matches every weekend like popular sports... lol.
Are you sure it ain't Bandy, also called "Russian hockey"? Any source to back up your claim? After doing some online research, Bandy is the national sport of Russia. I can't find any info that suggests football is lol.