[MENTION=752]akaishiki[/MENTION] it's a matter of perspective actually. For me personally, Russian is not that hard of a language to learn. I don't have any problems with communication so my Russian develops really fast. The only problem I have is that I am too lazy to actually learn the grammar properly. It's hard, but not too tough to master at the "enough-to-naturally-communicate" level. Many told me that Japanese is the hardest language to learn, tbh.
[MENTION=4367]Fuuyumi[/MENTION] I suppose you're not in Russia then. Just read manga/watch anime (dubbed! - it'll raise your listening skills)/read VN in Russian and you'll be as good as before in no time. The Russian manga/anime community is actually really strong. Also, feel free to talk to me in Russian.