Edit: Take the below with a grain of salt, this is one personal experience which can/should not be extrapolated from. There are good/bad people in all nations.
When I was 16 we were on vacation and played waterball in a pool against a russian family. When they realized we were winning (all members of my family were playing handball for life, so this was no wonder) they started to do things like pulling pants and punching underneath the water surface, scratching with the fingernails etc. They still lost.
Back then I could not understand why anyone would deploy such methods in a game during their vacation. For me personally, it would be entirely unpleasant and unenjoyable to envolve myself that much in a non-serious game. But maybe the answer is contained in that video: Maybe it is just much more normal to deploy the whole arsenal of what you can do in russian culture. I guess if you don't try everything and then loose you are seen as an idiot or as a weak person. I grew up in a culture where the rules of society are taken comparedly serious, so for me playing unfair is a sign of weakness (proof you cannot win by the rules).