Some of the comments in here
Nuke has every right to go back to Russia if he feels that is the best place for him to be going forward, which it very well might be. 2 years in KHL with good playing time and a place where he is more comfortable is not a bad thing for his development at all.
It's not like he is breaking his contract or anything, which is what you might think considering the comments in this thread. And it's not like it's impossible for him to return after those 2 years in the KHL anyway. The kid is 21, he's got plenty of time.
Either way it's his choice. Maybe you guys should go play 3 years in Russia and then I can call you a baby or entitled <nationality> when you go home.
Very good post.