not sure why they're put together ?
"Mexico and Russia (we're not sure why they're put together either)"
You can throw in Brazil, too, if You like. Due to a very different business culture and a different interpretation of "truth" You need to be made from a special kind of wood to deal with those countries if You are raised in a rather, how do I say, tame society.
Let's compare it to a card game:
If You play cards in, say, a Scandinavian country with a fella, and he cheats You, You will wrap it up and not play with him anymore.
In the named countries the card game will be only a facade. The real game is about who cheats whom smarter. And nobody gets upset! In the contrary, the better cheater gets a lot of respect for his skills.
That's where they are similar. Having them handled by the same team makes a lot sense to me.
Please note that I don't mean to judge here. Different country, different customs. Me personally, I love Brazil ;-)