Could a non-aggression pact with Germany prevent World War II?

no, the non-aggression pact was signed only to delay the preparation of the USSR for war. Moreover, the fascists considered themselves a “holy duty” to extol the Aryan nation and to belittle and even exterminate the Jews. And the Slavs, i.e. Russians are, in a way, also Jews, so Germany could not conquer everyone, but not conquer the country with the hated nation. And one more thing – the lands of Russia were quite rich in minerals and fertile soils. Hitler planned on these lands to extract coal, oil and non-ferrous metals from the bowels of the earth with the hands of “subhumans” and to grow crops to feed the inhabitants of Germany.