My experience with sellers in Moscow is poor, mainly because of incredibly long shipping times between the USA and Russia. Or at least, according to the sellers - who can really know for sure half a world away? It has taken months for a small package to transit the distance, and in the case of any issues, months more for the package to return, then more months for yet another trip back to me. Not worth it for $60-some US, IMHO. I'll pay twice that to source an item in this country just to avoid the headaches even if the seller in Moscow is above reproach.
Assuming I am the seller in the US shipping to Moscow, unless the buyer is willing to pay for air shipment, it can be 6 months before anything can be considered resolved. And what happens if one party is not ultimately satisfied? Organizations like Paypal have time limits on their guarantees. This can mean that if I send an item the buyer is not happy with, it's possible I won't see said item for perhaps three months after the transaction. At which point, both buyer and seller are out of luck if one or the other renegs. And if both buyer and seller are willing to pay air shipping charges both ways, the additional costs incurred remove any incentive to sell the item in the first place.
FWIW, I would be willing to buy from Russia if the item warrants air shipment and is a tracked package. I am NOT willing to sell to a buyer in that region simply because there are too many opportunities for unhappiness on both sides. It has nothing to do with my faith in the good nature of Russian people, it has to do with the practicalities of trade spanning the globe.