At first I thought it was just me. But then I started talking to other players on pokerstars chat. Brazilians and Russians are extremely aggressive players when they playing your hands. The most people hate this.
How do you play with that "extremely aggressive" players?
Tighten your range, don't make hero calls for no reason, because, even if players are loose and aggressive, they may end up with a hand here and there, and play it the same way as if they hold nothing.
Considering labeling, that Russian and Brazilian players are the ones who are very aggressive, it is not really true. Thing is there are more players from those two countries then any other, therefore, You are just seeing them play
hands more often, and therefore gave them a label as aggressive players.
Try not to generalize that much, as You can end up making certain moves, based on an assumption that particular Russian or Brazilian player is aggressive by default, when they don't necessarily need to be.