reblogging to give credit. From the notes:
This is Natalya Kopylova, the head of the Samara club of Slavic cultures “Vesta”. What she is doing is usually called “фланкировка” in Russian, which, I think, would be translated as flourish or twirling here. It’s a traditional Cossack entertainment, demonstration of dexterity and ability to handle weapon. In the comments to the video on YouTube it was pointed that Natalya wears traditional Orenburg Cossack dress and twirls traditional Cossack weapons shashkas (шашки).