How do I win a map (particulary if it's in Europe)

Ok um, I'm new to the forums but I need urgent help. Seriously. Like everytime when I play Risk I always end up sometimes having Russia, and when I do someone is always trying to take it from me. And like if I don't have Russia I get pissed and I sometimes try to conquer it but I lose. Now I know I have an obsession but let's forget about that. How do I win a game by conquering or defending Russia, or just defending and conquering my territories and Europe. Basically how do I win a game? Because I'm a recruit and I lost my first game, and I want to know how to get better at Online Risk. Can someone post a strategy or something relating to Russia or not relating that's O.K. too. Cuz when I get Russia I want to defend it well. Also the map I usually play is Europe so if someone can give me a plain strategy on that, that always works, that would be fine.