Why did the Soviet Union win the Soviet-Finnish War in World War II?

The topography, traffic and climate here are different from those in the Central European Plain. It is easy to defend but difficult to attack, which is beneficial to defense and not to attack.

Winter is long and cold, windy and snowy, and the temperature is often below MINUS 30 ~ 40 degrees. It coincides with the shortest day in a year, and the long night greatly limits the offensive advantage. It is catching up with a heavy snow with a depth of 1 m, which brings great inconvenience to the action, but it provides Finland, which is good at skiing, with an opportunity to show its talents. Here, the land is vast and sparsely populated, with dense forests, vertical and horizontal lakes and inconvenient transportation.