I know some people have been putting Grebs down for his defensive play in Manchester, but I was impressed with his play in the few games he played in the NHL. I don't think we should give up on him so quickly...
Let's see what Grebeshkov could due over the course of an entire NHL season before we start judging his performance or thinking of getting rid of him. He hasn't reached 21 yet and he is only going to get better. As risky as his play may be, remember that guys like Ozolinsh and Gonchar and Zubov were accused of the same thing. I think it's fair to say that they have enjoyed successful and productive careers in the NHL. Once again, I'm not saying Grebeshkov will be as good as those guys, but he has the potential to reach that level (along with another Russian defenseman I am very fond of, Fedor Tyutin).
At this point, the one young Russian defenseman who I think will be a stellar player and should be representing his nation in big tournaments in the not so distant future will be Anton Volchenkov. He was at the top of my list amongst defenseman in the 2000 draft, and I believe he will prove to be better than the group of defensemen drafted ahead of him that year.
Just remember, it takes a bit longer for most defenseman to step up and become regular contributors at the pro level, and Grebeshkov is close to reaching that point.