There is like one example recently of Russian forwards developing well out of NA, Kucherov, and he only partially developed in NA. All the rest completely developed in the KHL.
I think its best for them to develop at home, develop into a top player in the second best league in the world, and then they can adjust when they are a little older and ready to play in the NHL.
Flying kids halfway across the world to a foreign culture and foreign concept of hockey isn't smart, in my opinion. If they are actually good, they'll work their way up in the KHL and eventually join the NHL. If they can't eventually break through in the KHL, they won't do so in the NHL. If they get less minutes the first season or two, so what? He's a 17 year old kid. What's the rush? Give him 3-4 years, and if he is as good as some think, he should be ready for the NHL by then.