Why did russia sign a non-aggression treaty with adolf hitler?

Plz ? ? 20 points for this question ! hhjc6

How were japan's actions before and during world war 2 compare with germany's actions over the same period

Me ! which of the following statements describes how the punic wars contributed to the development of the roman empire? a)they allowed the romans to focus more on expanding into the western mediterranean. b)they resulted in the overthrow of the roman republic and establishment of the empire. c)they marked the end of roman expansion in the mediterranean region. d) they forced the romans to reorganize their government with an emperor as ruler.