Did russia win or lose World War 2?

The russia was the first one to invade German capital and u.s. and other alliences helped. Germany reached as far as Stalingrad but was shut down by freezing temperatures and was forced to retreat, by the time they decided to do that the was was already lost and Berlin was captured.

Some people say they won and some people say they lost.

The Soviet Union (Russia) was part of the Allies and the Allies achieved victorious.