Why is the non aggression pact important?

For his part, Hitler wanted a nonaggression pact with the Soviet Union so that his armies could invade Poland virtually unopposed by a major power, after which Germany could deal with the forces of France and Britain in the west without having to simultaneously fight the Soviet Union on a second front in the east.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.