What does the chart indicate about signing of the German-Soviet Nonaggression (Molotov-Ribbentrop) Pact?

The Molotov-Ribbentrop Non-Aggression pact between the Nazi Germany and Soviet Union serves as a pact that divide the eastern part of Europe between Nazi and the Soviet Union sphere of influence and control. One example of this is the invasion of the two belligerents to Poland and divide Poland between the two powers. Also it improves the diplomatic stance between the two countries with two different ideologies. But it will soon be broken by the Germans when they invade Soviet Union.