Not as a player. As a player they are pretty much same as every1 else, but as a teammate... well that's a different story.
If they play alone, and there aren't more than one or two russian everything is OK as long as team and more importantly they are performing well, but when they start to underperdorm they'll start raging and yelling in russuan.
Worst situation is to have 3-4 player russian premade. They are using voice chat as normal ppl use discord and keep constantly yelling in russian, they won' give any calls in english and start raging if you are not doing as they told (in russian)