What particular mustard do you have in mind? The Russian/Ukrainian mustards I've tried couldn't hold a candle to Dijon. Too tame.
Too tame? That’s odd, generally Russians make a far more intense style of Mustard than Dijon.
Zakuson is a quite good Russian style mustard, widely available because it’s made in Canada.
No such mustard where I live. Tomorrow I'm going to a BBQ though, so I'm going to buy a whole set of mustards and let the best one win. I'll remember to get some Russian ones.