International contributions on Cryptotalk have stopped almost completely but Russian replies are still very active, I don't know why.
Cryptotalk has connection with Yobit, a shady exchange. Probably Yobit is not seen more international traffic, probably most people using that exchange are from Russia. Also that English section is full of spammers, maybe the Russian board too, but I do not know. The reason woukd be from those two has always been my guess.