Russia's Power Shot is called "Ice Shot." A ball of ice is shot through the air towards the other player's goal. The ball doesn't travel completely horizontally but makes a little downward curve. If the opponent blocks the shot, he will be frozen in a block of ice for a short period of time, able to be kicked and dashed into the goal. This shot, however, is relatively easy to counter, just because it dips down after a certain distance allowing the player to counter it easier. Although the power shot has a nice effect due to its speed the outcome after the ball hit you will be similar, making it harder to score even if you froze your opponent.
To unlock Russia and make him a playable character, you must upgrade the Speed, Jump and Kick abilities at their superlative. Do the unlock requirements or pay 500,000 points to instantly unlock him. It will take 1,534,500 points to upgrade the speed, jump and kick to the max, but then, you don't need to upgrade half your stats anymore, which is somewhat useful. So it is recommended to unlock him with the upgrade way, because then you'll end up spending more points by doing it the points way, as you'll need to upgrade your stats sometime.
The fastest way to earn enough points to upgrade your stats and unlock him is playing a lot of Head Cups. Since coming in the top 3 earns you a fairly decent amount of points, you can repeat the Head Cup several times, while trying to unlock other characters. Paying points for him isn't a smart thing to do, as you will still need to upgrade your stats to become better at the game. It's important to note, that if you use Mon-K in the Head Cup, your reward will be doubled making it even easier to unlock him.