Actually, and you can Google this, but the D'Psi Kawakki Koo language is the hardest in the world to learn. The language requires the person to make clicking sounds with his tongue, a combination of whistling and clearing one's throat, as well as mixed sign language integrated into the verbal aspect. And the kicker is you can only learn by going out to to the island which won't allow boats, so you have to swim through infested crocodile and piranha waters.
So please do your research more thoroughly next time before you simply say "Oh, Russia is the hardest of languages to learn"