By “the country that started WW2”, do you mean Germany or Russia? Because the USSR was also one of the initial aggressors of WW2. They invaded Poland together, divided eastern Europe between the USSR and Nazi Germany, invaded the Baltics and Finland. The USSR and Nazi Germany were basically allies until Hitler betrayed Stalin and invaded.
By “the country that started WW2”, do you mean Germany or Russia? Because the USSR was also one of the initial aggressors of WW2. They invaded Poland together, divided eastern Europe between the USSR and Nazi Germany, invaded the Baltics and Finland. The USSR and Nazi Germany were basically allies until Hitler betrayed Stalin and invaded.
They weren’t allies. Pick up a history book.